in-sincerest

insincere

[in-sin-seer]
adjective
not sincere; not honest in the expression of actual feeling; hypocritical.

Origin:
1625–35; < Latin insincērus tainted, dishonest; see in-3, sincere

insincerely, adverb


deceitful, disingenuous, guileful, two-faced.
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World English Dictionary
insincere (ˌɪnsɪnˈsɪə)
 
adj
lacking sincerity; hypocritical
 
insin'cerely
 
adv
 
insincerity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

insincere
1634, from L. insincerus "not genuine, not pure, adulterated," from in- "not" + sincerus (see sincere).
Online Etymology Dictionary, © 2010 Douglas Harper
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