Meaning: In a state of mind that prevents normal perception, behavior, or social interaction.

Part of speech: adjective

Example: His insane ideas shocked everyone.

Synonyms:

• crazy
• mad

Antonyms:

• sane
• rational

Meaning: Unclean or unhealthy; not sanitary.

Part of speech: adjective

Example: The insanitary conditions led to an outbreak of disease.

Category: Health

Synonyms:

• unhygienic
• dirty

Antonyms:

• clean
• hygienic

Meaning: A state of mental illness or disorder.

Part of speech: noun

Example: The court ruled that he was not guilty by reason of insanity.

Synonyms:

• madness
• lunacy

Antonyms:

• sanity
• rationality

Meaning: Impossible to satisfy; always wanting more.

Part of speech: adjective

Example: Her insatiable appetite for knowledge drove her to read every book.

Category: Psychology

Synonyms:

• unquenchable
• insatiate

Antonyms:

• satisfied
• content

Meaning: To write or carve words on a surface.

Part of speech: verb

Example: They decided to inscribe their names on the trophy.

Category: Arts

Synonyms:

• engrave
• etch

Antonyms:

• erase
• obliterate

Meaning: Words that are written or engraved on a surface.

Part of speech: noun

Example: The inscription on the plaque was hard to read.

Category: Arts

Synonyms:

• engraving
• carving

Antonyms:

• blank
• unmarked

Meaning: Difficult to understand or interpret.

Part of speech: adjective

Example: His inscrutable expression made it hard to know what he was thinking.

Category: Literature

Synonyms:

• enigmatic
• mysterious

Antonyms:

• clear
• obvious

Meaning: A small arthropod animal that has six legs and generally one or two pairs of wings.

Part of speech: noun

Example: The insect landed on the flower.

Category: Nature

Synonyms:

• bug
• creature

Antonyms:

• mammal
• bird

Meaning: A chemical used to kill insects.

Part of speech: noun

Example: Farmers often use insecticide to protect their crops.

Category: Agriculture

Synonyms:

• pesticide
• bug spray

Antonyms:

• fertilizer
• herbicide

Meaning: Not confident or assured; uncertain.

Part of speech: adjective

Example: He felt insecure about his abilities.

Synonyms:

• unconfident
• unsafe

Antonyms:

• secure
• confident

Meaning: To introduce sperm into a female's reproductive system.

Part of speech: verb

Example: The veterinarian will inseminate the cow.

Category: Medicine

Synonyms:

• impregnate
• fertilize

Antonyms:

• sterilize
• prevent

Meaning: Lacking sensitivity or compassion.

Part of speech: adjective

Example: His insensitive remarks hurt her feelings.

Category: Psychology

Synonyms:

• unfeeling
• callous

Antonyms:

• sensitive
• compassionate

Meaning: Unable to be separated; closely connected.

Part of speech: adjective

Example: They were inseparable friends since childhood.

Category: Relationships

Synonyms:

• unbreakable
• indivisible

Antonyms:

• separable
• divisible

Meaning: To put something into something else.

Part of speech: verb

Example: Please insert your card into the machine.

Category: Technology

Synonyms:

• add
• place

Antonyms:

• remove
• extract

Meaning: Referring to training or education while employed.

Part of speech: adjective

Example: She attended an in-service training session.

Category: Education

Synonyms:

• on-the-job
• continuing education

Antonyms:

• off-duty
• inactive

Meaning: A small picture or map inserted within a larger one.

Part of speech: noun

Example: The inset showed the city in detail.

Category: Arts

Synonyms:

• insert
• addition

Antonyms:

• removal
• exclusion

Meaning: Located or occurring near the shore.

Part of speech: adjective

Example: The inshore waters are usually calmer.

Category: Nature

Synonyms:

• coastal
• nearshore

Antonyms:

• offshore
• distant

Meaning: Within the interior of something.

Part of speech: adverb

Example: The cat is inside the house.

Category: Location

Synonyms:

• within
• interior

Antonyms:

• outside
• exterior

Meaning: A person who has special knowledge or access to a particular organization or situation.

Part of speech: noun

Example: As an insider, she knew all the secrets of the company.

Category: Business

Synonyms:

• member
• insider trader

Antonyms:

• outsider
• stranger

Meaning: The illegal practice of trading on the stock exchange to one's own advantage through having access to confidential information.

Part of speech: noun

Example: Insider trading can lead to severe penalties.

Category: Business › Finance

Synonyms:

• stock manipulation
• insider dealing

Antonyms:

• transparent trading
• fair trading

Meaning: Proceeding in a gradual, subtle way but with harmful effects.

Part of speech: adjective

Example: The insidious disease spread without any noticeable symptoms.

Category: Health

Synonyms:

• sly
• treacherous

Antonyms:

• harmless
• safe

Meaning: The ability to gain an accurate understanding of something.

Part of speech: noun

Example: Her insight into human behavior is remarkable.

Category: Psychology

Synonyms:

• understanding
• awareness

Antonyms:

• ignorance
• misunderstanding

Meaning: A badge or emblem indicating membership or rank.

Part of speech: noun

Example: The insignia on his uniform showed he was a captain.

Category: Arts

Synonyms:

• emblem
• badge

Antonyms:

• plainness
• simplicity

Meaning: The quality of being unimportant or trivial.

Part of speech: noun

Example: He felt a sense of insignificance in the large crowd.

Category: Philosophy

Synonyms:

• triviality
• unimportance

Antonyms:

• significance
• importance

Meaning: Too small or unimportant to be worth consideration.

Part of speech: adjective

Example: The difference in price was insignificant.

Category: Philosophy

Synonyms:

• trivial
• unimportant

Antonyms:

• significant
• important

Meaning: Not expressing genuine feelings; hypocritical.

Part of speech: adjective

Example: His insincere apology did not convince anyone.

Category: Communication

Synonyms:

• hypocritical
• fake

Antonyms:

• sincere
• genuine

Meaning: To suggest or hint at something indirectly.

Part of speech: verb

Example: He tried to insinuate that she was lying.

Category: Communication

Synonyms:

• imply
• suggest

Antonyms:

• declare
• state

Meaning: Suggesting or hinting at something in a sly or indirect way.

Part of speech: adjective

Example: Her insinuating tone made him uncomfortable.

Category: Communication

Synonyms:

• suggestive
• implying

Antonyms:

• direct
• clear

Meaning: Lacking flavor or interest; dull.

Part of speech: adjective

Example: The soup was insipid and needed more seasoning.

Category: Food

Synonyms:

• bland
• dull

Antonyms:

• flavorful
• exciting

Meaning: To demand something forcefully, not accepting refusal.

Part of speech: verb

Example: She insisted on paying for dinner.

Category: Communication

Synonyms:

• demand
• assert

Antonyms:

• yield
• submit

Meaning: Demanding attention or attention to something.

Part of speech: adjective

Example: He was insistent that the meeting start on time.

Category: Communication

Synonyms:

• persistent
• determined

Antonyms:

• indifferent
• yielding

Meaning: To the extent that; as far as.

Part of speech: phrase

Example: Insofar as I know, the meeting is still on.

Category: Communication

Synonyms:

• to the extent
• as far as

Meaning: The inner sole of a shoe.

Part of speech: noun

Example: He replaced the insole for better comfort.

Category: Fashion

Synonyms:

• inner sole
• footbed

Meaning: Showing a rude and arrogant lack of respect.

Part of speech: adjective

Example: His insolent behavior got him in trouble.

Category: Communication

Synonyms:

• rude
• impudent

Antonyms:

• respectful
• polite

Meaning: Incapable of being solved or explained.

Part of speech: adjective

Example: The problem seemed insoluble.

Category: Mathematics

Synonyms:

• unsolvable
• irresolvable

Antonyms:

• solvable
• resolvable

Meaning: The state of being unable to pay debts.

Part of speech: noun

Example: The company's insolvency led to bankruptcy.

Category: Business › Finance

Synonyms:

• bankruptcy
• failure

Antonyms:

• solvency
• wealth

Meaning: Unable to pay debts; bankrupt.

Part of speech: adjective

Example: The insolvent company was forced to close.

Category: Business

Synonyms:

• bankrupt
• broke

Antonyms:

• solvent
• wealthy

Meaning: The inability to sleep.

Part of speech: noun

Example: She suffers from insomnia and often feels tired.

Category: Health

Synonyms:

• sleeplessness
• restlessness

Antonyms:

• sleep
• rest

Meaning: A person who suffers from insomnia.

Part of speech: noun

Example: As an insomniac, he often struggles to stay awake during the day.

Category: Health

Synonyms:

• sleepless person
• night owl

Antonyms:

• sleeper
• rested person

Meaning: Casual lack of concern; indifference.

Part of speech: noun

Example: His insouciance about the deadline surprised everyone.

Category: Psychology

Synonyms:

• carelessness
• indifference

Antonyms:

• concern
• worry