Bedeutung von “doubtful” — Learner’s Dictionary

doubtful

adjective us uk /ˈdaʊtfəl/
NOT PROBABLE

B2 not probable:

It's doubtful if/whether he'll be able to come.
[ + (that) ] It's doubtful that anyone survived the fire.
NOT CERTAIN

B2 not feeling certain about something:

She's still doubtful about her decision.
doubtfully adverb

(Definition von “doubtful” aus dem Cambridge Learner's Dictionary © Cambridge University Press)