doubtfuluncertainunsurein doubthesitantundecidedunsettledunconfirmedundeterminedindefiniteunresolvedup in the airwaveringvacillatingirresolutein a quandaryin a dilemmaon the horns of a dilemmaskepticalsuspiciousinformal：iffy
2
not to be relied upon; suspect.
extremely dubious assumptions
同义词：
suspicioussuspectunder suspicionuntrustworthyunreliableundependablequestionableequivocalambiguousindeterminateindefiniteunclearvagueimprecisehazypuzzlingenigmaticcrypticopen to questiondebatablequestionableinformal：shadyfishyfunnynot kosherdodgy
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dubious的示例
Alex looked dubious, but complied
time-sharing has been brought into disrepute by dubious sales methods
she earned the dubious distinction of being the lowest-paid teacher in the nation
