Synonyms of illogical

illogical

adjective

(ˌ)i(l)-ˈlä-ji-kəl 

as in unreasonable

not using or following good reasoning

the illogical claim that playing basketball makes people taller because one sees so many tall players

illogical people are likely to believe every sensational claim made on TV

Synonyms & Similar Words

• unreasonable
• irrational
• unreasoning
• illegitimate
• misleading
• absurd
• unreasoned
• weak
• foolish
• silly
• fallacious
• invalid
• nonrational
• unsound
• inconsequential
• weird
• meaningless
• inconsequent
• inconsistent
• unusual
• odd
• strange
• specious
• misguided
• nonsensical
• sophistic
• asinine
• insane
• random
• surreal
• preposterous
• unconsidered
• inexplicable
• ill-advised
• disorganized
• wacky
• unconvincing
• eristic
• mad
• unexplainable
• disordered
• senseless
• unaccountable
• half-baked
• nutty
• reasonless
• peculiar
• rambling
• Kafkaesque

Antonyms & Near Antonyms

• logical
• reasonable
• rational
• valid
• sound
• sensible
• wise
• sane
• justified
• reasoned
• sober
• enlightened
• just
• plausible
• well-founded
• informed
• well-grounded
• compelling
• commonsense
• clear
• certain
• solid
• persuasive
• credible
• organized
• true
• convincing
• satisfying
• sure
• cogent
• ordered
• demonstrated
• confirmed
• established
• substantiated
• validated
• corroborated

Example Sentences

Recent Examples of illogical

On the outside, firing the coach of a first-place team seemed illogical. — Jason Lloyd, New York Times, 19 June 2026

He’s made his way into the backrooms and finds that the place keeps going, offering up illogical doorways and holes in the floor. — Alison Willmore, Vulture, 29 May 2026

Many professional teams pretzel themselves into illogical positions when putting and keeping players on their rosters. — Troy Renck, Denver Post, 19 May 2026

If that sounds illogical, trainer Chad Brown, who will start Emerging Market in a bid to win his first Derby, can explain. — Assistant Sports Editor, Los Angeles Times, 30 Apr. 2026