unthinking

[uhn-thing-king]
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:
1670–80; un-1 + thinking

unthinkingly, adverb
unthinkingness, noun
Dictionary.com Unabridged

unthink

[uhn-thingk]
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. 2014.
Cite This Source Link To unthinking
Collins
World English Dictionary
unthink (ʌnˈθɪŋk)
 
vb , -thinks, -thinking, -thought
1.  to reverse one's opinion about
2.  to dispel from the mind

unthinking (ʌnˈθɪŋkɪŋ)
 
adj
1.  lacking thoughtfulness; inconsiderate
2.  heedless; inadvertent: it was done in an unthinking moment
3.  not thinking or able to think
 
un'thinkingly
 
adv
 
un'thinkingness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Unthinking, uncaring natural selection drives all changes in lifeforms that inhabit this universe and perhaps others.
Any challenge to their ideology is meant with fierce and unthinking rejection.
Economic incentives only work when there is a known goal or method and only
  more unthinking efforts are needed.
That's a symptom of the sort of culture we've become, one that's disposable,
  that runs on unthinking convenience.
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