not certain and slightly suspicious about sth; doubtful
possibly or probably dishonest, disreputable or risky
"they were doubtful that the cord would hold"
"it was doubtful whether she would be admitted"
"dubious about agreeing to go"
"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"
"they admitted the force of my argument but remained dubious"
The islands began to grow dubious on the horizon.
出自： T. Heggen
I had the dubious satisfaction of knowing that I had been 'put on their files'.
出自： J. F. Lehmann