illogical

I1L1L1O1G2I1C3A1L1
/ɪˈlɒ.dʒɪ.kəl/

adjective

Contrary to logic; lacking sense or sound reasoning.

“I received an illogical reply and that left me standing there feeling confused.”

Similar
absurdirrationalunreasoningunsoundunlogicalinconsequentialintuitivenonrational
Opposite
logical
OriginEnglish logical ← Middle English in- ← Latin in- →
Less commonScrabble 12
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Meanings

adjectiveillogical (comparative more illogical, superlative most illogical)

comparative more illogical · superlative most illogical

  1. Contrary to logic; lacking sense or sound reasoning.

    I received an illogical reply and that left me standing there feeling confused.

    2 more examples

    Your highly emotional reaction is most illogical.

    1967 November 10, “Metamorphosis”, in Star Trek, season 2, episode 9, spoken by Mr. Spock (Leonard Nimoy)

    'Cause I was feeling so illogical, d-d-d-igital

    1979, “The Logical Song”, in Roger Hodgson (lyrics), Breakfast in America, performed by Supertramp

    Synonyms: absurd, irrational, unreasoning, unsound · Antonyms: logical

Synonyms & antonyms

adjectiveContrary to logic; lacking sense or sound reasoning.

Similar
absurdirrationalunreasoningunsound
Opposite
logical

More synonyms by meaning

adjectivelacking in correct logical relation

Similar
unlogicalabsurdinconsequentialintuitivenonrationalvisceral
Opposite
logical

adjectivelacking orderly continuity

Similar
confuseddisconnecteddisjointeddisorderedgarbledscatteredunconnectedincoherent
Also see
absurdchop logicchoplogicalconfuseddisconnecteddisjointeddisorderedgarbledillegitimateillogicinconsequentialintuitivescatteredunconnectedunlogicalvisceral

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinin-
  5. Middle Englishin-
  6. Englishil-
  7. Englishlogical
  8. Englishillogical

From il- + logical.

Full word history & related roots →

Translations

Ancient Greek ἄλογος
  • ἄλογος (álogos)contrary to logic; lacking sense or sound reasoning
Catalan il·lògic
  • il·lògiccontrary to logic; lacking sense or sound reasoning
Chinese Mandarin 不合邏輯 /不合逻辑, 悖理
  • 不合邏輯 /不合逻辑 (bùhé luójí)contrary to logic; lacking sense or sound reasoning
  • 悖理 (bèilǐ)contrary to logic; lacking sense or sound reasoning
  • 荒謬 /荒谬 (huāngmiù)contrary to logic; lacking sense or sound reasoning
  • 乖戾 (guāilì)contrary to logic; lacking sense or sound reasoning
Czech nelogický
  • nelogickýcontrary to logic; lacking sense or sound reasoning
Dutch onlogisch
  • onlogischcontrary to logic; lacking sense or sound reasoning
Esperanto nelogika
  • nelogikacontrary to logic; lacking sense or sound reasoning
Finnish epälooginen
  • epälooginencontrary to logic; lacking sense or sound reasoning
French illogique
  • illogiquecontrary to logic; lacking sense or sound reasoning
German unlogisch
  • unlogischcontrary to logic; lacking sense or sound reasoning
Greek άλογος
  • άλογος (álogos)contrary to logic; lacking sense or sound reasoning
Hebrew חסר היגיון
  • חסר היגיון (khasár higayón)contrary to logic; lacking sense or sound reasoning
Hungarian észszerűtlen, logikátlan
  • észszerűtlencontrary to logic; lacking sense or sound reasoning
  • logikátlancontrary to logic; lacking sense or sound reasoning
Italian illogico
  • illogicocontrary to logic; lacking sense or sound reasoning
Japanese 支離滅裂な, 非論理的な
  • 支離滅裂な (shirimetsuretsu na)contrary to logic; lacking sense or sound reasoning
  • 非論理的な (hi ronriteki na)contrary to logic; lacking sense or sound reasoning
Korean 동우각마
  • 동우각마 (dong'ugangma)contrary to logic; lacking sense or sound reasoning
Lithuanian nelogiškas
  • nelogiškascontrary to logic; lacking sense or sound reasoning
Norwegian Bokmål ulogisk
  • ulogiskcontrary to logic; lacking sense or sound reasoning
Polish nielogiczny
  • nielogicznycontrary to logic; lacking sense or sound reasoning
Portuguese ilógico, antilógico
  • ilógicocontrary to logic; lacking sense or sound reasoning
  • antilógicocontrary to logic; lacking sense or sound reasoning
Romanian ilogic, nelogic
  • ilogiccontrary to logic; lacking sense or sound reasoning
  • nelogiccontrary to logic; lacking sense or sound reasoning
Russian нелоги́чный
  • нелоги́чный (nelogíčnyj)contrary to logic; lacking sense or sound reasoning
Spanish ilógico
  • ilógicocontrary to logic; lacking sense or sound reasoning
Swedish ologisk
  • ologiskcontrary to logic; lacking sense or sound reasoning
Thai ไร้เหตุผล
  • ไร้เหตุผล (Rị̂ h̄etup̄hl)contrary to logic; lacking sense or sound reasoning
Turkish mantıksız
  • mantıksızcontrary to logic; lacking sense or sound reasoning
Ukrainian нелогі́чний
  • нелогі́чний (nelohíčnyj)contrary to logic; lacking sense or sound reasoning
Vietnamese phi lôgic
  • phi lôgiccontrary to logic; lacking sense or sound reasoning

Rhymes & wordplay

Rhymes with illogical

biologicallogicalpsychologicaltechnologicalgeologicaltheologicalarchaeologicalphysiologicalchronologicalneurologicalmeteorologicalsociologicaltopologicalpedagogicalastrologicalanthropologicalpharmacologicalhydrologicalimmunologicalmythologicalphonologicalhistologicalepistemologicalgynecological
All rhymes →
Cite this entry
APA

illogical. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/illogical

MLA

“illogical.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/illogical. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “illogical,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/illogical.

Source: illogical on Wiktionary, CC BY-SA 4.0.