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.
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
That's what show business is, sincere insincerity. Benny Hill
Every single instance of a friend's insincerity increases our dependence on the efficacy of money. William Shenstone
Marriage always demands the greatest understanding of the art of insincerity possible between two human beings. Vicki Baum