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doubt·ful
 doubtful
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- pronunciation:
- daUt
f
 l
- 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, convinced, positive, sure
- similar words:
- perplexed
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| definition 2: |
not likely; not probable.
It is doubtful that we will have rain today.- antonyms:
- likely
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| definition 3: |
of uncertain result.
The night before the presidential election, some states were still doubtful.- synonyms:
- indefinite, uncertain
- antonyms:
- definite
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| related words: |
fishy, hesitant, incredible, indefinite, insecure, suspicious, tentative, uncertain |
| derivations: |
doubtfully (adv.), doubtfulness (n.) |
The word doubtful
contains the following part:
-ful1
Old English
adjective-forming suffix
that means full of
  More about this word part:
The suffix -ful1 attaches to native English nouns to form adjectives.
Example words:
awful, beautiful, careful, cheerful, colorful, delightful, doubtful, dutiful, faithful, fearful, graceful, harmful, helpful, hopeful, joyful, meaningful, painful, peaceful, plentiful, powerful, purposeful, respectful, skillful, stressful, successful, thankful, thoughtful, wasteful, useful
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