inadvertent

[in-uhd-vur-tnt]
adjective
1.
unintentional: an inadvertent insult.
2.
not attentive; heedless.
3.
of, pertaining to, or characterized by lack of attention.

Origin:
1645–55; abstracted from inadvertence, inadvertency; see -ent

inadvertently, adverb


2. inattentive. 3. thoughtless, careless, negligent.
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World English Dictionary
inadvertent (ˌɪnədˈvɜːtənt)
 
adj
1.  failing to act carefully or considerately; inattentive
2.  resulting from heedless action; unintentional
 
inad'vertently
 
adv

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

inadvertent
1650s, ultimately from inadvertence (1560s), from Scholastic L. inadvertentia, from in- "not" + advertentia, from L. advertere "to direct one's attention to," lit. "to turn toward" (see advertise).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The next six factors account for the odds that there is any transmission to
  listen to, either deliberate or inadvertent.
Of course, not all inadvertent discoveries have such rosy outcomes.
Perhaps they fed off human refuse or benefited from inadvertent shelter from
  predators.
It seems fair to presume that every war will result in inadvertent civilian
  casualties.
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