illogical

[ih-loj-i-kuhl] / ɪˈlɒdʒ ɪ kəl /

ADJECTIVE

not making sense

Synonyms

STRONGEST

absurd false groundless implausible inconsistent incorrect irrational irrelevant preposterous senseless unreasonable unscientific untenable

WEAK

casuistic cockeyed fallacious fatuous faulty hollow inconclusive incongruous inconsequent invalid mad meaningless not following nutty off the wall screwy self-contradictory sophistic sophistical specious spurious unconnected unproved unsound unsubstantial wacky without basis without foundation

Antonyms

STRONGEST

correct logical rational reasonable right sensible true wise

WEAK

meaningful

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Although this sequence seems illogical, it is arguably allowed under current accounting rules.

From MarketWatch • Apr. 27, 2026

The idea that a warning should change the legal calculus of excessive force, now at the center of both of these cases, is callous and illogical.

From Slate • Apr. 21, 2026

Educational AI, he told journalist Taylor Lorenz, generated “false information” or “illogical questions, illogical texts.”

From Salon • Mar. 30, 2026

"The bill is unevidenced, illogical and will help no-one in Scotland - least of all greyhounds," he said.

From BBC • Mar. 18, 2026

Both acts were as illogical as adding 1 + 1 to get 3.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Vocabulary lists containing illogical

Inside Out & Back Again

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

The Devil's Arithmetic

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

Way Off: Synonyms for "Wrong"

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!