Synonyms of dubious in English:

dubious


See US English definition of dubious

See UK English definition of dubious

See Spanish definition of dudoso

adjective

1‘I was rather dubious about the whole idea’

SYNONYMS
doubtful, uncertain, unsure, in doubt, hesitant
undecided, unsettled, unconfirmed, undetermined, indefinite, unresolved, up in the air
wavering, vacillating, irresolute, in a quandary, in a dilemma, on the horns of a dilemma
sceptical, suspicious
informal iffy
ANTONYMS

certain, definite

2‘a dubious businessman’

SYNONYMS
suspicious, suspect, under suspicion, untrustworthy, unreliable, undependable, questionable
informal shady, fishy, funny, not kosher
British informal dodgy
ANTONYMS

trustworthy

3‘she gave him a dubious reply’

SYNONYMS
equivocal, ambiguous, indeterminate, indefinite, unclear, vague, imprecise, hazy, puzzling, enigmatic, cryptic
open to question, debatable, questionable
ANTONYMS

decisive, clear, definite