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doubt·ful

doubtful

 
pronunciation:
daUt fl
features:
Word Explorer, Word Parts
part of speech: adjective
definition 1: having or causing doubt.
He was doubtful that he would finish the race.The evidence is doubtful.
synonyms:
skeptical, suspicious, uncertain, undecided
antonyms:
certain, clear, positive, sure
definition 2: not likely; not probable.
It is doubtful that we will have rain today.
antonyms:
likely
definition 3: of uncertain result.
The night before the presidential election, some states were still doubtful.
synonyms:
indefinite, uncertain
antonyms:
definite
derivations: doubtfully (adv.), doubtfulness (n.)
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Word Parts  About this feature
The word doubtful contains the following part:
-ful1 Old English adjective-forming suffix that means full of
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The suffix -ful1 attaches to native English nouns to form adjectives.