Meaning: Not achieving maximum productivity.

Part of speech: adjective

Example: The system was inefficient and needed improvement.

Category: Business

Synonyms:

• wasteful
• unproductive

Antonyms:

• efficient
• productive

Meaning: Not qualified or entitled to do something.

Part of speech: adjective

Example: She was ineligible to apply for the scholarship.

Category: Education

Synonyms:

• unqualified
• disqualified

Antonyms:

• eligible
• qualified

Meaning: The state of being unequal, especially in status or opportunities.

Part of speech: noun

Example: Economic inequality is a major issue in society.

Category: Politics

Synonyms:

• disparity
• inequity

Antonyms:

• equality
• parity

Meaning: Certain to happen; unavoidable.

Part of speech: adjective

Example: Change is an inevitable part of life.

Category: Philosophy

Synonyms:

• unavoidable
• certain

Antonyms:

• avoidable
• uncertain

Meaning: Lack of experience or knowledge.

Part of speech: noun

Example: Her inexperience showed during the presentation.

Category: Education

Synonyms:

• naivety
• immaturity

Antonyms:

• experience
• expertise

Meaning: Lacking experience or knowledge.

Part of speech: adjective

Example: The inexperienced staff needed more training.

Category: Education

Synonyms:

• novice
• untrained

Antonyms:

• experienced
• skilled

Meaning: The state of being a baby or very young.

Part of speech: noun

Example: The project is still in its infancy.

Category: General

Synonyms:

• babyhood
• childhood

Meaning: Soldiers trained and equipped to fight on foot.

Part of speech: noun

Example: The infantry was deployed to the front lines.

Category: Military

Synonyms:

• foot soldiers
• troops

Meaning: A soldier who fights on foot.

Part of speech: noun

Example: The infantryman bravely charged into battle.

Category: Military

Synonyms:

• soldier
• trooper

Meaning: To make someone or something ill by introducing a disease.

Part of speech: verb

Example: The virus can infect healthy cells.

Category: Medicine › Infectious Diseases

Synonyms:

• contaminate
• transmit

Meaning: Having a disease or infection.

Part of speech: adjective

Example: The infected wound required medical attention.

Category: Medicine › Infectious Diseases

Synonyms:

• contaminated
• diseased

Meaning: The invasion of the body by harmful microorganisms.

Part of speech: noun

Example: The infection spread quickly through the community.

Category: Medicine › Infectious Diseases

Synonyms:

• contamination
• disease

Meaning: Capable of being transmitted from one person to another.

Part of speech: adjective

Example: The flu is an infectious disease.

Category: Medicine › Infectious Diseases

Synonyms:

• contagious
• transmissible

Meaning: To deduce or conclude information from evidence.

Part of speech: verb

Example: From the data, we can infer that sales will increase.

Category: Logic

Synonyms:

• deduce
• conclude

Meaning: Lower in rank, status, or quality.

Part of speech: adjective

Example: He felt inferior to his colleagues.

Category: General

Synonyms:

• lesser
• subordinate

Antonyms:

• superior
• better

Meaning: To invade or occupy in large numbers, often causing harm.

Part of speech: verb

Example: The garden was infested with pests.

Category: Nature

Synonyms:

• invade
• overrun

Meaning: A person who does not believe in a particular religion.

Part of speech: noun

Example: In some cultures, an infidel may be viewed with suspicion.

Category: Religion

Synonyms:

• nonbeliever
• heretic

Antonyms: believer

Meaning: A place for the care of the sick or injured.

Part of speech: noun

Example: The school has an infirmary for students.

Category: Health

Synonyms:

• hospital
• clinic

Meaning: Easily set on fire; flammable.

Part of speech: adjective

Example: The inflammable materials must be stored safely.

Category: Safety

Synonyms:

• flammable
• combustible

Antonyms: non-flammable

Meaning: Capable of being filled with air or gas.

Part of speech: adjective

Example: They bought an inflatable pool for the summer.

Category: Manufacturing

Synonyms:

• blow-up
• air-filled

Meaning: The rate at which the general level of prices for goods and services rises.

Part of speech: noun

Example: Inflation can erode purchasing power.

Category: Economics

Synonyms:

• price rise
• increase

Antonyms: deflation

Meaning: Occurring during a flight.

Part of speech: adjective

Example: The in-flight entertainment kept passengers occupied.

Category: Travel

Synonyms: during flight

Meaning: To have an effect on the character, development, or behavior of someone or something.

Part of speech: verb

Example: Parents can greatly influence their children's values.

Category: Communication

Synonyms:

• affect
• sway

Antonyms: deter

Meaning: A viral infection that affects the respiratory system.

Part of speech: noun

Example: Influenza can cause severe illness in vulnerable populations.

Category: Health

Synonyms:

• flu
• virus

Meaning: A television program that acts as an advertisement.

Part of speech: noun

Example: The infomercial was very persuasive.

Category: Marketing

Synonyms:

• advertisement
• commercial

Meaning: Providing useful or interesting information.

Part of speech: adjective

Example: The lecture was very informative.

Category: Education

Synonyms:

• educational
• insightful

Antonyms: uninformative

Meaning: Having or showing knowledge about a particular subject.

Part of speech: adjective

Example: She is well-informed about current events.

Category: Education

Synonyms:

• knowledgeable
• aware

Antonyms: uninformed

Meaning: The basic physical systems and structures needed for the operation of a society.

Part of speech: noun

Example: The city's infrastructure needs significant investment.

Category: Engineering

Synonyms:

• framework
• foundation

Meaning: Not occurring often; rare.

Part of speech: adjective

Example: Infrequent visits can lead to misunderstandings.

Category: Time

Synonyms:

• rare
• occasional

Antonyms: frequent

Meaning: The act of breathing in.

Part of speech: noun

Example: Inhalation of smoke can be harmful.

Category: Health

Synonyms:

• breathing in
• inspiration

Meaning: A device used to deliver medication into the lungs.

Part of speech: noun

Example: He uses an inhaler for his asthma.

Category: Health

Synonyms:

• device
• spray

Meaning: To receive property or a title after someone's death.

Part of speech: verb

Example: She will inherit her grandmother's house.

Category: Law

Synonyms:

• receive
• acquire

Antonyms: forfeit

Meaning: Property or money received from someone after their death.

Part of speech: noun

Example: His inheritance allowed him to travel the world.

Category: Law

Synonyms:

• legacy
• heritage

Meaning: A person who inherits property or a title.

Part of speech: noun

Example: As the sole inheritor, she received everything.

Category: Law

Synonyms:

• heir
• successor

Meaning: Restrained or held back in one's actions or feelings.

Part of speech: adjective

Example: She felt inhibited in the large crowd.

Synonyms:

• restrained
• self-conscious

Antonyms:

• uninhibited
• free

Meaning: Done within an organization rather than by external parties.

Part of speech: adjective

Example: The company prefers in-house training for its employees.

Category: Business

Synonyms:

• internal
• within

Antonyms:

• external
• outsourced

Meaning: The ability to assess and initiate things independently.

Part of speech: noun

Example: She showed great initiative in her work.

Synonyms:

• enterprise
• action

Antonyms:

• laziness
• inactivity

Meaning: To introduce a substance into something, often using a needle.

Part of speech: verb

Example: The nurse will inject the vaccine.

Synonyms:

• introduce
• insert

Antonyms:

• remove
• extract

Meaning: The act of introducing a substance into something, often using a needle.

Part of speech: noun

Example: The injection was quick and painless.

Synonyms:

• shot
• dose

Antonyms:

• removal
• extraction

Meaning: Additional time added to a game due to injuries.

Part of speech: noun

Example: The referee announced injury time at the end of the match.

Category: Sports

Synonyms:

• stoppage time
• added time