thoughtless

[thawt-lis]
adjective
1.
lacking in consideration for others; inconsiderate; tactless: a thoughtless remark.
2.
characterized by or showing lack of thought: a shallow, thoughtless book.
3.
not thinking enough; careless or heedless: thoughtless of his health.
4.
devoid of or lacking capacity for thought.

Origin:
1585–95; thought1 + -less

thoughtlessly, adverb
thoughtlessness, noun


1. negligent, neglectful. 3. inattentive, remiss.
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World English Dictionary
thoughtless (ˈθɔːtlɪs)
 
adj
1.  inconsiderate: a thoughtless remark
2.  having or showing lack of thought: a thoughtless essay
3.  unable to think; not having the power of thought
 
'thoughtlessly
 
adv
 
'thoughtlessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

thoughtless
"inconsiderate," 1794, from thought + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Such willful or wanton negligence must be more than mere thoughtlessness,
  inadvertence, or simple inattention.
For whoever who has left this original comment, the high degree of
  thoughtlessness is appalling.
Conflict is everywhere, ranging from a single disagreement to persistent or
  prolonged thoughtlessness.
Thus the relation of thoughtlessness to evil became concrete.
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