un·con·vinc·ing 
/ˌʌnkənˈvɪnsɪŋ/ adjective
/ˌʌnkənˈvɪnsɪŋ/ adjective [more unconvincing; most unconvincing] : not able to make you believe that something is true, real, or acceptable : not convincing
▪ His arguments for changing the rules were unconvincing. ▪ a novel with unconvincing characters
▪ His arguments for changing the rules were unconvincing. ▪ a novel with unconvincing characters
