mistrustful
adjective uk/ˌmɪsˈtrʌst.fəl/ us/ˌmɪsˈtrʌst.fəl/
对（某人）的诚信（或能力）有怀疑
having doubts about the honesty or abilities of someone
Voters are bound to be mistrustful of a government that has broken so many promises. 选民们肯定不会信任曾多次违背诺言的政府。