adj.半信半疑的，犹豫不决的,可疑的,暧昧的，含糊的,不可靠的
They would now find some dubious pretext to restart the war.
他们现在会找个蹩脚的借口重新发动战争。
Soho was still a highly dubious area.
索霍区仍然是个靠不住的地方。
I was rather dubious about the whole idea.
我对这整个想法持怀疑态度。