[ uhn-thing-king ]
See synonyms for unthinking on Thesaurus.com
  1. thoughtless; heedless; inconsiderate: an unthinking, tactless person.

  2. indicating lack of thought or reflection: a dull, unthinking expression on his face.

  1. not endowed with the faculty of thought: unthinking matter.

  2. not exercising thought; not given to reflection: This book will not profit an unthinking person.

  3. not thinking; unmindful: chores done in an unthinking manner.

Origin of unthinking

First recorded in 1670–80; un-1 + thinking

Other words from unthinking

  • un·think·ing·ly, adverb
  • un·think·ing·ness, noun

Words Nearby unthinking

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use unthinking in a sentence

  • Such is the recognized method by which the great unthinking public is taught to think.

  • This was most probably, in many instances a mere unthinking conformity to ancient use and wont.

    The Catacombs of Rome | William Henry Withrow
  • The heartless, unthinking girls tripped gaily down to the carriage, and drove off.

    Newton Forster | Captain Frederick Marryat
  • Although we talked for a long time I did not really learn much from these Boers, who represented the most unthinking class.

    The Relief of Mafeking | Filson Young
  • With unthinking swiftness, he threw his arm over her and drew her tight to him.

    The Girl and The Bill | Bannister Merwin

British Dictionary definitions for unthinking


/ (ʌnˈθɪŋkɪŋ) /

  1. lacking thoughtfulness; inconsiderate

  2. heedless; inadvertent: it was done in an unthinking moment

  1. not thinking or able to think

Derived forms of unthinking

  • unthinkingly, adverb
  • unthinkingness, noun

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