im·pec·ca·ble

[im-pek-uh-buhl]
adjective
1.
faultless; flawless; irreproachable: impeccable manners.
2.
not liable to sin; incapable of sin.

Origin:
1525–35; < Latin impeccābilis faultless, sinless. See im-2, peccable

im·pec·ca·bil·i·ty, noun
im·pec·ca·bly, adverb


1. unassailable, unexceptionable.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
impeccable (ɪmˈpɛkəbəl) [Click for IPA pronunciation guide]
 
adj
1.  without flaw or error; faultless: an impeccable record
2.  rare incapable of sinning
 
[C16: from Late Latin impeccābilis sinless, from Latin im- (not) + peccāre to sin]
 
impecca'bility
 
n
 
im'peccably
 
adv

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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00:10
Impeccable is always a great word to know.
So is ninnyhammer. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

impeccable
1531, "not capable of sin," from M.Fr. impeccable (15c.), from L. impeccabilis "not liable to sin," from in- "not" + pecare "to sin," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nevertheless, the evidence for this planet's existence seemed impeccable.
Whatever you think of his policy, the process was impeccable.
The apartment has good bones and an impeccable pedigree.
In addition to impeccable room amenities, the resort has convenient access to
  the ski slopes, tennis courts and golf courses.
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