Meaning: not able to be clearly defined

Part of speech: adjective

Example: The beauty of the sunset was almost indefinable.

Category: General

Synonyms:

• unclassifiable
• indeterminate

Antonyms:

• definable
• clear

Meaning: not clearly defined or determined

Part of speech: adjective

Example: He has an indefinite amount of time to complete the project.

Synonyms:

• uncertain
• vague

Antonyms:

• definite
• clear

Meaning: for an unlimited or unspecified period

Part of speech: adverb

Example: The event has been postponed indefinitely.

Category: General

Synonyms:

• unlimitedly
• indeterminately

Antonyms:

• definitely
• certainly

Meaning: not able to be erased or removed

Part of speech: adjective

Example: The indelible ink left a permanent mark.

Category: General

Synonyms:

• permanent
• unforgettable

Antonyms:

• erasable
• temporary

Meaning: lacking in sensitivity or tact

Part of speech: adjective

Example: His indelicate remarks made everyone uncomfortable.

Category: General

Synonyms:

• tactless
• insensitive

Antonyms:

• delicate
• sensitive

Meaning: too unusual or extreme to be adequately described

Part of speech: adjective

Example: The beauty of the landscape was indescribable.

Category: General

Synonyms:

• inexpressible
• unspeakable

Antonyms:

• describable
• expressible

Meaning: a list of items, often with references to their location

Part of speech: noun

Example: The index at the back of the book helps you find topics quickly.

Category: General

Synonyms:

• list
• catalog

Meaning: to point out or show

Part of speech: verb

Example: The sign will indicate the direction to the museum.

Category: General

Synonyms:

• show
• point out

Antonyms:

• conceal
• hide

Meaning: a sign or piece of information that suggests something

Part of speech: noun

Example: The dark clouds are an indication of rain.

Category: General

Synonyms:

• sign
• hint

Meaning: serving as a sign or indication

Part of speech: adjective

Example: His smile was indicative of his happiness.

Category: General

Synonyms:

• suggestive
• representative

Antonyms:

• unindicative
• non-representative

Meaning: a sign that shows the state or level of something

Part of speech: noun

Example: The fuel gauge is an indicator of how much gas is left.

Category: General

Synonyms:

• sign
• gauge

Meaning: plural of index; lists or indicators

Part of speech: noun

Example: The indices of the stock market showed a decline.

Category: General

Synonyms:

• indexes
• lists

Meaning: not direct; roundabout

Part of speech: adjective

Example: He took an indirect route to avoid traffic.

Category: General

Synonyms:

• circuitous
• roundabout

Antonyms:

• direct
• straight

Meaning: showing a lack of good judgment in speech or action

Part of speech: adjective

Example: His indiscreet comments caused a scandal.

Category: General

Synonyms:

• imprudent
• tactless

Antonyms:

• discreet
• prudent

Meaning: lack of good judgment or care in behavior

Part of speech: noun

Example: Her indiscretion led to serious consequences.

Category: General

Synonyms:

• imprudence
• tactlessness

Antonyms:

• discretion
• prudence

Meaning: done at random or without careful judgment

Part of speech: adjective

Example: The indiscriminate use of pesticides can harm the environment.

Category: General

Synonyms:

• random
• haphazard

Antonyms:

• discriminating
• selective

Meaning: absolutely necessary; essential

Part of speech: adjective

Example: Water is indispensable for life.

Category: General

Synonyms:

• essential
• necessary

Antonyms:

• dispensable
• unnecessary

Meaning: unable to be challenged or denied

Part of speech: adjective

Example: The evidence was indisputable.

Category: General

Synonyms:

• undeniable
• irrefutable

Antonyms:

• disputable
• questionable

Meaning: not clear or sharply defined

Part of speech: adjective

Example: The voice was indistinct over the noise.

Category: General

Synonyms:

• unclear
• faint

Antonyms:

• distinct
• clear

Meaning: not able to be identified as different

Part of speech: adjective

Example: The twins were indistinguishable from each other.

Category: General

Synonyms:

• identical
• similar

Antonyms:

• distinguishable
• different

Meaning: a single human being

Part of speech: noun

Example: Each individual has unique qualities.

Category: General

Synonyms:

• person
• human

Antonyms:

• group
• collective

Meaning: unable to be divided or separated

Part of speech: adjective

Example: The nation is indivisible and united.

Category: General

Synonyms:

• unbreakable
• inseparable

Antonyms:

• divisible
• separable

Meaning: laziness or avoidance of activity

Part of speech: noun

Example: His indolence led to missed opportunities.

Category: General

Synonyms:

• sloth
• laziness

Antonyms:

• diligence
• industriousness

Meaning: wanting to avoid activity or exertion; lazy

Part of speech: adjective

Example: He was too indolent to get out of bed.

Category: General

Synonyms:

• lazy
• inactive

Antonyms:

• active
• energetic

Meaning: impossible to subdue or defeat

Part of speech: adjective

Example: Her indomitable spirit inspired everyone.

Category: General

Synonyms:

• unconquerable
• invincible

Antonyms:

• submissive
• defeated

Meaning: located or happening inside a building

Part of speech: adjective

Example: We have an indoor swimming pool.

Category: General

Synonyms:

• inside
• interior

Antonyms:

• outdoor
• exterior

Meaning: inside a building

Part of speech: adverb

Example: It's warm indoors during winter.

Category: General

Synonyms:

• inside
• within

Antonyms:

• outdoors
• outside

Meaning: certain; not to be doubted

Part of speech: adjective

Example: Her talent is indubitable.

Category: General

Synonyms:

• undeniable
• unquestionable

Antonyms:

• doubtful
• questionable

Meaning: to bring about or give rise to

Part of speech: verb

Example: The medication may induce sleep.

Category: General

Synonyms:

• cause
• bring about

Antonyms:

• prevent
• stop

Meaning: Having or showing no skill; clumsy.

Part of speech: adjective

Example: His inept handling of the situation made it worse.

Category: General

Synonyms:

• clumsy
• incompetent

Antonyms:

• skilled
• competent

Meaning: Lack of skill or ability.

Part of speech: noun

Example: His ineptitude in managing the project was evident.

Category: General

Synonyms:

• incompetence
• ineffectiveness

Meaning: Not essential; not necessary.

Part of speech: adjective

Example: The details were inessential to the main argument.

Category: General

Synonyms:

• unnecessary
• nonessential

Antonyms:

• essential
• necessary

Meaning: Too great to be calculated or estimated.

Part of speech: adjective

Example: Her contributions to the project were of inestimable value.

Category: General

Synonyms:

• priceless
• immeasurable

Meaning: In a way that cannot be avoided.

Part of speech: adverb

Example: Inevitably, the sun will rise tomorrow.

Category: General

Synonyms:

• certainly
• unavoidably

Meaning: Not able to be justified or forgiven.

Part of speech: adjective

Example: His behavior was inexcusable.

Category: General

Synonyms:

• unjustifiable
• unpardonable

Antonyms:

• justifiable
• forgivable

Meaning: Lacking skill or expertise.

Part of speech: adjective

Example: His inexpert handling of the equipment caused a malfunction.

Category: General

Synonyms:

• unskilled
• inept

Antonyms:

• skilled
• expert

Meaning: In a way that is impossible to separate.

Part of speech: adverb

Example: The two issues are inextricably linked.

Category: General

Synonyms:

• inseparably
• entangled

Meaning: Incapable of making mistakes or being wrong.

Part of speech: adjective

Example: The plan seemed infallible until it failed.

Category: General

Synonyms:

• unerring
• perfect

Antonyms:

• fallible
• imperfect

Meaning: Well known for a bad quality or deed.

Part of speech: adjective

Example: The infamous criminal was captured after years on the run.

Category: General

Synonyms:

• notorious
• disreputable

Meaning: The state of being well known for a bad quality or deed.

Part of speech: noun

Example: He achieved infamy for his role in the scandal.

Category: General

Synonyms:

• notoriety
• disgrace