• synonyms


  1. according to or agreeing with the principles of logic: a logical inference.
  2. reasoning in accordance with the principles of logic, as a person or the mind: logical thinking.
  3. reasonable; to be expected: War was the logical consequence of such threats.
  4. of or relating to logic.
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Origin of logical

From the Medieval Latin word logicālis, dating back to 1490–1500. See logic, -al1
Related formslog·i·cal·i·ty [loj-i-kal-i-tee] /ˌlɒdʒ ɪˈkæl ɪ ti/, log·i·cal·ness, nounlog·i·cal·ly, adverbhy·per·log·i·cal, adjectivehy·per·log·i·cal·ly, adverbhy·per·log·i·cal·ness, nounhy·per·log·i·cal·i·ty, nounnon·log·i·cal, adjectivenon·log·i·cal·ly, adverbnon·log·i·cal·ness, nounnon·log·i·cal·i·ty, nouno·ver·log·i·cal, adjectiveo·ver·log·i·cal·ly, adverbo·ver·log·i·cal·ness, nouno·ver·log·i·cal·i·ty, nounpre·log·i·cal, adjectivepre·log·i·cal·ly, adverbqua·si-log·i·cal, adjectivequa·si-log·i·cal·ly, adverbsu·per·log·i·cal, adjectivesu·per·log·i·cal·ly, adverbsu·per·log·i·cal·i·ty, nounun·log·i·cal, adjectiveun·log·i·cal·ly, adverb

Synonyms for logical

1, 3. valid.

Antonyms for logical

1–3. unreasonable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unlogical

Historical Examples of unlogical

  • Composition is nothing but the logic of vision; an uncomposed view is no more possible than an unlogical sentence.

    The Atlantic Monthly, Volume 13, No. 77, March, 1864


British Dictionary definitions for unlogical


  1. relating to, used in, or characteristic of logic
  2. using, according to, or deduced from the principles of logica logical conclusion
  3. capable of or characterized by clear or valid reasoning
  4. reasonable or necessary because of facts, events, etcthe logical candidate
  5. computing of, performed by, used in, or relating to the logic circuits in a computer
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Derived Formslogicality or logicalness, nounlogically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unlogical



early 15c., "based on reason," from logic + -al (1). Meaning "pertaining to logic" is c.1500. Attested from 1860 as "following as a reasonable consequence." Related: Logically.

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Online Etymology Dictionary, © 2010 Douglas Harper