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unthinking

[uhn-thing-king] /ʌnˈθɪŋ kɪŋ/
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
1670-1680
1670-80; un-1 + thinking
Related forms
unthinkingly, adverb
unthinkingness, noun

unthink

[uhn-thingk] /ʌnˈθɪŋk/
verb (used without object), unthought, unthinking.
1.
to end one's thought or reverse the process of thought.
verb (used with object), unthought, unthinking.
2.
to dispel from the mind:
Unthink your thoughts.
Origin
1590-1600; un-2 + think1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for unthinking

unthinking

/ʌnˈθɪŋkɪŋ/
adjective
1.
lacking thoughtfulness; inconsiderate
2.
heedless; inadvertent: it was done in an unthinking moment
3.
not thinking or able to think
Derived Forms
unthinkingly, adverb
unthinkingness, noun

unthink

/ʌnˈθɪŋk/
verb (transitive) -thinks, -thinking, -thought
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
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Word Origin and History for unthinking
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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