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.

The idea of a place being both isolating and illogical made sense to a cohort of people whose formative years were shaped by lockdown.

From The Wall Street Journal • Jun. 6, 2026

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

From MarketWatch • Apr. 27, 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

My thoughts grew illogical and fuzzy, and I distantly realized that I might actually succeed at falling asleep.

From "Endangered" by Eliot Schrefer

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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