in·ad·vert·ent

[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

in·ad·vert·ent·ly, adverb


2. inattentive. 3. thoughtless, careless, negligent.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To inadvertently
00:10
Inadvertently is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
Collins
World English Dictionary
inadvertent (ˌɪnədˈvɜːtənt) [Click for IPA pronunciation guide]
 
adj
1.  failing to act carefully or considerately; inattentive
2.  resulting from heedless action; unintentional
 
inad'vertently
 
adv

inadvertent (ˌɪnədˈvɜːtənt) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

inadvertently
1670s, lit. "inattentively," hence "unintentionally;" see inadvertent.

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
Apparently they believed that securing the lanyards would keep the generators
  from being fired inadvertently.
They are in pain and can inadvertently traumatize the students.
Well, to be kind the author obviously inadvertently conflated the terms decay
  and fission.
In addition, some carnivores may have inadvertently become trapped while
  pursuing their prey across the sticky ground.
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