/ Dictionary / Index I insincerity: Meaning and Definition of Find definitions for: in•sin•cer•i•ty Pronunciation: (in"sin-ser'i-tē), [key] — pl. -ties the quality of being insincere; lack of sincerity; hypocrisy; deceitfulness. an instance of being insincere: He recalled their many past insincerities. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insincerity (Thesaurus) insincere insinuate Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language