Meaning: The theory that all languages share a common structure.

Part of speech: noun

Example: Universal grammar explains how children learn languages.

Category: Language › Linguistics

Meaning: A set that contains all objects or elements under consideration.

Part of speech: noun

Example: In set theory, the universal set is fundamental.

Category: Mathematics › Set Theory

Meaning: The time standard used worldwide, also known as Coordinated Universal Time (UTC).

Part of speech: noun

Example: Universal Time is used for international timekeeping.

Category: Science › Timekeeping

Synonyms: UTC

Meaning: In a way that applies to all cases or situations.

Part of speech: adverb

Example: The rule is universally accepted.

Category: General

Synonyms: generally

Meaning: A family of multitasking, multiuser operating systems.

Part of speech: noun

Example: Unix is widely used in servers and workstations.

Category: Technology › Operating Systems

Synonyms: operating system

Meaning: Not able to be justified or defended.

Part of speech: adjective

Example: The decision was deemed unjustifiable.

Category: Law › Ethics

Synonyms: indefensible

Antonyms: justifiable

Meaning: Not having a good reason or justification.

Part of speech: adjective

Example: His actions were considered unjustified.

Category: Law › Ethics

Synonyms: unwarranted

Antonyms: justified

Meaning: Not able to be known or understood.

Part of speech: adjective

Example: The mysteries of the universe may be unknowable.

Category: Philosophy

Synonyms: incomprehensible

Meaning: the act of killing someone that is illegal.

Part of speech: noun

Example: He was charged with unlawful killing after the incident.

Category: Law › Criminal Law

Synonyms:

• murder
• homicide

Meaning: illiterate; unable to read or write.

Part of speech: adjective

Example: He felt unlettered in a world full of books.

Category: Education

Synonyms:

• illiterate
• uneducated

Antonyms:

• literate
• educated

Meaning: to free from restraint; to loosen.

Part of speech: verb

Example: He tried to unloose the knot in the rope.

Category: General

Synonyms:

• loosen
• untie

Antonyms:

• tighten
• bind

Meaning: not attractive or pleasant.

Part of speech: adjective

Example: The unlovely building stood out in the beautiful neighborhood.

Category: Arts

Synonyms:

• ugly
• unattractive

Antonyms:

• lovely
• beautiful

Meaning: not characteristic of a man; lacking masculinity.

Part of speech: adjective

Example: He was criticized for showing unmanly emotions.

Category: General

Synonyms:

• effeminate
• weak

Antonyms:

• manly
• masculine

Meaning: lacking good manners; rude.

Part of speech: adjective

Example: His unmannerly behavior shocked everyone at the party.

Category: General

Synonyms:

• rude
• impolite

Antonyms:

• polite
• courteous

Meaning: having no equal; unparalleled.

Part of speech: adjective

Example: Her talent is unmatched in the industry.

Category: General

Synonyms:

• unequaled
• incomparable

Antonyms:

• matched
• equal

Meaning: not suitable to be mentioned; taboo.

Part of speech: adjective

Example: They discussed unmentionable topics at the dinner.

Category: General

Synonyms:

• taboo
• unspeakable

Meaning: not aware or conscious of something.

Part of speech: adjective

Example: He was unmindful of the time passing.

Category: General

Synonyms:

• unaware
• oblivious

Antonyms:

• mindful
• aware

Meaning: absolute; not softened or lessened.

Part of speech: adjective

Example: The unmitigated disaster left the town in ruins.

Category: General

Synonyms:

• absolute
• unqualified

Antonyms:

• mitigated
• qualified

Meaning: not affected or influenced; indifferent.

Part of speech: adjective

Example: He remained unmoved by the criticism.

Category: General

Synonyms:

• indifferent
• unaffected

Antonyms:

• moved
• affected

Meaning: not having a good sense of music; lacking musical talent.

Part of speech: adjective

Example: He was considered unmusical by his peers.

Category: Arts

Synonyms:

• tone-deaf
• unmelodious

Antonyms:

• musical
• melodious

Meaning: not natural; artificial or forced.

Part of speech: adjective

Example: The colors in the painting looked unnatural.

Category: Nature

Synonyms:

• artificial
• forced

Antonyms:

• natural
• genuine

Meaning: to make someone feel anxious or afraid.

Part of speech: verb

Example: The sudden noise began to unnerve her.

Category: General

Synonyms:

• unsettle
• frighten

Antonyms:

• calm
• comfort

Meaning: not attracting attention; inconspicuous.

Part of speech: adjective

Example: She wore unobtrusive clothing to the meeting.

Category: General

Synonyms:

• inconspicuous
• discreet

Antonyms:

• obtrusive
• noticeable

Meaning: having no equal; unmatched.

Part of speech: adjective

Example: Her skills are unparalleled in the industry.

Category: General

Synonyms:

• unmatched
• incomparable

Antonyms:

• matched
• equal

Meaning: not able to be forgiven; inexcusable.

Part of speech: adjective

Example: His actions were deemed unpardonable by the committee.

Category: General

Synonyms:

• inexcusable
• unforgivable

Antonyms:

• pardonable
• forgivable

Meaning: not in accordance with parliamentary rules; inappropriate.

Part of speech: adjective

Example: His unparliamentary language was criticized.

Category: Politics

Synonyms:

• inappropriate
• improper

Antonyms:

• parliamentary
• appropriate

Meaning: not showing love or loyalty to one's country.

Part of speech: adjective

Example: His actions were considered unpatriotic.

Category: Politics

Synonyms:

• disloyal
• traitorous

Antonyms:

• patriotic
• loyal

Meaning: to remove stitches from fabric.

Part of speech: verb

Example: I need to unpick this seam to fix the dress.

Category: General

Synonyms:

• unstitch
• remove

Antonyms:

• stitch
• attach

Meaning: Not planned or thought out in advance.

Part of speech: adjective

Example: His unpremeditated actions surprised everyone.

Category: Law › Criminal Law

Synonyms:

• spontaneous
• impulsive

Antonyms:

• planned
• deliberate

Meaning: Not attractive or appealing.

Part of speech: adjective

Example: The building was unprepossessing but functional.

Category: Arts › Architecture

Synonyms:

• unattractive
• plain

Antonyms:

• attractive
• appealing

Meaning: Not suitable for printing, often due to offensive content.

Part of speech: adjective

Example: The article contained unprintable language.

Category: Media

Synonyms:

• offensive
• indecent

Antonyms:

• printable
• acceptable

Meaning: Not caused by any action or event; spontaneous.

Part of speech: adjective

Example: The attack was unprovoked.

Category: Law › Criminal Law

Synonyms:

• unjustified
• unwarranted

Antonyms:

• provoked
• justified

Meaning: Not able to be satisfied or quenched.

Part of speech: adjective

Example: She had an unquenchable thirst for knowledge.

Category: Education › Learning

Synonyms:

• insatiable
• unappeasable

Antonyms:

• satisfied
• quenched

Meaning: Not inclined to question or doubt.

Part of speech: adjective

Example: She had an unquestioning faith in her team.

Category: Social Issues

Synonyms:

• uncritical
• accepting

Antonyms:

• questioning
• doubtful

Meaning: Not calm or peaceful; restless.

Part of speech: adjective

Example: The unquiet sea made sailing difficult.

Category: Nature › Weather

Synonyms:

• restless
• agitated

Antonyms:

• calm
• peaceful

Meaning: To indicate the end of a quotation.

Part of speech: verb

Example: He said, 'This is a great idea,' unquote.

Category: Language

Synonyms:

• end quote
• stop quoting

Meaning: Not based on reason or logic; irrational.

Part of speech: adjective

Example: His unreasoning fear kept him from trying new things.

Category: Psychology

Synonyms:

• irrational
• illogical

Antonyms:

• reasonable
• logical

Meaning: Not acknowledged or identified.

Part of speech: adjective

Example: His contributions went unrecognized.

Category: Social Issues

Synonyms:

• unacknowledged
• ignored

Antonyms:

• recognized
• acknowledged

Meaning: Not changed or reformed; stubbornly traditional.

Part of speech: adjective

Example: He remained unreconstructed in his beliefs.

Category: Politics

Synonyms:

• unrepentant
• stubborn

Antonyms:

• reformed
• changed

Meaning: Not processed or purified; crude.

Part of speech: adjective

Example: The oil was unrefined and had a strong taste.

Category: Science › Chemistry

Synonyms:

• crude
• raw

Antonyms:

• refined
• processed