INSINCERITY
insincerity, falseness, hollowness
(noun) the quality of not being open or truthful; deceitful or hypocritical
Source: WordNet® 3.1
Etymology
Noun
insincerity (countable and uncountable, plural insincerities)
Property of being insincere, lacking sincerity or truthfulness.
Antonyms
• sincerity
Source: Wiktionary
In`sin*cer"i*ty, n. Etym: [Cf. F. insincérité.]
Definition: The quality of being insincere; want of sincerity, or of being
in reality what one appears to be; dissimulation; hypocritical;
deceitfulness; hollowness; untrustworthiness; as, the insincerity of
a professed friend; the insincerity of professions of regard.
What men call policy and knowledge of the world, is commonly no other
thing than dissimulation and insincerity. Blair.
Source: Webster’s Unabridged Dictionary 1913 Edition