- 1[not usually before noun] dubious (about something)/(about doing something) (of a person) not certain and slightly suspicious about something; not knowing whether something is good or bad synonym doubtful I was pretty dubious about the whole idea.
- 2(disapproving) probably not honest synonym suspicious They indulged in some highly dubious business practices to obtain their current position in the market.
- 3 that you cannot be sure about; that is probably not good They consider the plan to be of dubious benefit to most families. (ironic) She had the dubious honor of being chosen to head a failing company (= it was not an honor at all).
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