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unthinking

[uhn-thing-king]
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adjective
  1. thoughtless; heedless; inconsiderate: an unthinking, tactless person.
  2. indicating lack of thought or reflection: a dull, unthinking expression on his face.
  3. not endowed with the faculty of thought: unthinking matter.
  4. not exercising thought; not given to reflection: This book will not profit an unthinking person.
  5. not thinking; unmindful: chores done in an unthinking manner.

Origin of unthinking

First recorded in 1670–80; un-1 + thinking
Related formsun·think·ing·ly, adverbun·think·ing·ness, noun

unthink

[uhn-thingk]
verb (used without object), un·thought, un·think·ing.
  1. to end one's thought or reverse the process of thought.
verb (used with object), un·thought, un·think·ing.
  1. to dispel from the mind: Unthink your thoughts.

Origin of unthink

First recorded in 1590–1600; un-2 + think1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unthinking

unthinking

adjective
  1. lacking thoughtfulness; inconsiderate
  2. heedless; inadvertentit was done in an unthinking moment
  3. not thinking or able to think
Derived Formsunthinkingly, adverbunthinkingness, noun

unthink

verb -thinks, -thinking or -thought (tr)
  1. to reverse one's opinion about
  2. to dispel from the mind
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 unthinking

adj.

"unreflecting," 1670s, from un- + present participle of think.

Online Etymology Dictionary, © 2010 Douglas Harper