adj.难以预测的；难以预料的，未定局的；怀疑的，拿不准的；不明不白 双语释义：adj.(形容词)难以预测的,未定的 uncertain; not settled怀疑的,可疑的 not trusting; questionable英英释义： doubtful[ 'dautful ]adj.open to doubt or suspicion"the candidate's doubtful past"同义词：dubiousdubitablein question(p)fraught with uncert