[ uhn-thing-king ]
/ ʌnˈθɪŋ kɪŋ /


thoughtless; heedless; inconsiderate: an unthinking, tactless person.
indicating lack of thought or reflection: a dull, unthinking expression on his face.
not endowed with the faculty of thought: unthinking matter.
not exercising thought; not given to reflection: This book will not profit an unthinking person.
not thinking; unmindful: chores done in an unthinking manner.

Origin of unthinking

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


un·think·ing·ly, adverbun·think·ing·ness, noun

Definition for unthinking (2 of 2)

[ uhn-thingk ]
/ ʌnˈθɪŋk /

verb (used without object), un·thought, un·think·ing.

to end one's thought or reverse the process of thought.

verb (used with object), un·thought, un·think·ing.

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. 2019

Examples from the Web for unthinking

British Dictionary definitions for unthinking (1 of 2)

/ (ʌnˈθɪŋkɪŋ) /


lacking thoughtfulness; inconsiderate
heedless; inadvertentit was done in an unthinking moment
not thinking or able to think

Derived forms of unthinking

unthinkingly, adverbunthinkingness, noun

British Dictionary definitions for unthinking (2 of 2)

/ (ʌnˈθɪŋk) /

verb -thinks, -thinking or -thought (tr)

to reverse one's opinion about
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