in·sin·cere 
/ˌɪnsɪnˈsiɚ/ adjective
/ˌɪnsɪnˈsiɚ/ adjective [more insincere; most insincere] : not expressing or showing true feelings : not sincere
▪ He said he was sorry, but I could tell that he was being insincere. ▪ insincere praise/flattery ▪ an insincere apology
▪ He said he was sorry, but I could tell that he was being insincere. ▪ insincere praise/flattery ▪ an insincere apology
— in·sin·cere·ly adverb
▪ smiling insincerely
▪ smiling insincerely
— in·sin·cer·i·ty /ˌɪnsɪnˈserəti/ noun [noncount]
▪ the insincerity of his apology
/ˌɪnsɪnˈserəti/ noun [noncount] ▪ the insincerity of his apology
