1. the quality of not being honest about one’s true feelings, thoughts, or intentions; lack of genuineness

Examples

• His insincerity was obvious when he apologized without meaning it.
• The politician’s insincerity became apparent during the debate.
• She detected a note of insincerity in his compliments.
• The company’s apology was criticized for its insincerity.
• His smile couldn’t hide the insincerity behind his words.
• The insincerity of her praise made everyone uncomfortable.