per·ti·na·cious

[pur-tn-ey-shuhs]
adjective
1.
holding tenaciously to a purpose, course of action, or opinion; resolute.
2.
stubborn or obstinate.
3.
extremely or objectionably persistent: a pertinacious salesman from whom I could not escape.

Origin:
1620–30; pertinaci(ty) + -ous

per·ti·na·cious·ly, adverb
per·ti·na·cious·ness, noun


1. persevering. 2. dogged.
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World English Dictionary
pertinacious (ˌpɜːtɪˈneɪʃəs) [Click for IPA pronunciation guide]
 
adj
1.  doggedly resolute in purpose or belief; unyielding
2.  stubbornly persistent
 
[C17: from Latin pertināx, from per- (intensive) + tenāx clinging, from tenēre to hold]
 
perti'naciously
 
adv
 
pertinacity
 
n
 
perti'naciousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Cite This Source
00:10
Pertinacious is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
Example sentences
By this means he undoubtedly escapes much pertinacious annoyance.
There was something in the moody and dogged silence of this pertinacious companion, that was mysterious and appalling.
Again, he teaches the pertinacious upholders of these things not to judge their opponents.
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