Every single instance of a friend's insincerity increases our dependence on the efficacy of money.

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.

Insincerity is always weakness; sincerity even in error is strength.

That's what show business is, sincere insincerity.

I like the enthusiasm but not the insincerity of Los Angeles.

Marriage always demands the greatest understanding of the art of insincerity possible between two human beings.

This is the age of insincerity. The movies had the misfortune to come along in the twentieth century, and because they appeal to the masses there can be no sincerity in them.