Definitions

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.

If that sounds illogical, trainer Chad Brown, who will start Emerging Market in a bid to win his first Derby, can explain.

From Los Angeles Times • Apr. 29, 2026

Publishing them means that other people can read and scrutinize them, and mock the justices when they write illogical, unsupported or embarrassing opinions.

From Salon • Apr. 22, 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

“It is the most illogical thing in the world, and time will prove itself.”

From The Wall Street Journal • Feb. 4, 2026

I don't want her to think I'm yelling at her, and even if it is completely illogical, I don't want her to be angry with me.

From "Starfish" by Akemi Dawn Bowman

Vocabulary lists containing illogical

Inside Out & Back Again

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The Devil's Arithmetic

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Way Off: Synonyms for "Wrong"

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