un·think·ing

[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

un·think·ing·ly, adverb
un·think·ing·ness, noun
00:10
Unthinking is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Dictionary.com Unabridged

un·think

[uhn-thingk] verb, un·thought, un·think·ing.
verb (used without object)
1.
to end one's thought or reverse the process of thought.
verb (used with object)
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. 2013.
Cite This Source Link To unthinking
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World English Dictionary
unthink (ʌnˈθɪŋk) [Click for IPA pronunciation guide]
 
vb , -thinks, -thinking, -thought
1.  to reverse one's opinion about
2.  to dispel from the mind

unthinking (ʌnˈθɪŋkɪŋ) [Click for IPA pronunciation guide]
 
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
It is not the work pupils do that jades them, but the drudgery that unthinking teachers sometime impose.
That's a symptom of the sort of culture we've become, one that's disposable,
  that runs on unthinking convenience.
The key to successfully regulating markets is not to either create more or less
  regulation in an unthinking way.
Economic incentives only work when there is a known goal or method and only
  more unthinking efforts are needed.
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