Noun
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.
Source: Webster's dictionaryThat's what show business is--sincere insincerity. Benny Hill
The great enemy of clear language is insincerity. When there is a gap between one's real and one's declared aims, one turns, as it were, instinctively to long words and exhausted idioms, like a cuttlefish squirting out ink. George Orwell
Insincerity is always weakness; sincerity even in error is strength. George Henry Lewes
There are many justifications of silence; there can be none of insincerity. George Henry Lewes
Where the questions of religion are concerned people are guilty of every possible kind of insincerity and intellectual misdemeanor. Sigmund Freud
Marriage always demands the greatest understanding of the art of insincerity possible between two human beings. Vicki Baum