doubtful

英['daʊtfʊl;-f(ə)l] 美['daʊtfəl]

1. open to doubt or suspicion;: "the candidate's doubtful past"; "he has a dubious record indeed"; "what one found uncertain the other found dubious or downright false"; "it was more than dubitable whether the friend was as influential as she thought"- Karen Horney

2. fraught with uncertainty or doubt;: "they were doubtful that the cord would hold"; "it was doubtful whether she would be admitted"; "dubious about agreeing to go"