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doubt·ful
 doubtful
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- pronunciation:
- daUt
f
 l
- features:
- Word Combinations (adjective), Word Explorer, Word Parts
| part of speech: |
adjective |
| definition 1: |
having or causing doubt.
- synonyms:
- dubious, irresolute, skeptical, suspicious, uncertain, undecided
- antonyms:
- assured, believable, certain, clear, convinced, doubtless, indubitable, positive, sure, undoubted
- similar words:
- borderline, distrustful, equivocal, indecisive, mistrustful, perplexed, unbelieving, uneasy
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| definition 2: |
of uncertain result.
- synonyms:
- equivocal, indefinite, indeterminate, uncertain, undetermined
- antonyms:
- definite
- similar words:
- precarious, questionable
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| definition 3: |
of uncertain reliability or honesty.
- synonyms:
- dubious, questionable, uncertain, unreliable
- antonyms:
- reliable
- similar words:
- apocryphal, conjectural, problematic, shady, unpredictable
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| definition 4: |
improbable.
- synonyms:
- improbable, unlikely
- antonyms:
- likely
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| related words: |
agnostic, dim, fishy, hesitant, inconceivable, incredible, indefinite, insecure, slender, suspect, suspicious, tentative, uncertain, vague |
adverb + (adj.)doubtful
bit, equally, extremely, first, highly, increasingly, somewhat
(adj.)doubtful
+ adverb
ever
(adj.)doubtful
+ noun
credibility, expression, giant, legality, military, origin, proposition, prospect, provenance, smile, success, tone, utility
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| 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, boastful, careful, cheerful, colorful, deceitful, delightful, disgraceful, disrespectful, doubtful, dutiful, faithful, fearful, flavorful, fruitful, gleeful, graceful, harmful, helpful, hopeful, insightful, joyful, meaningful, merciful, mournful, painful, peaceful, plentiful, powerful, prayerful, purposeful, regretful, resentful, resourceful, respectful, scornful, skillful, sorrowful, stressful, successful, tactful, tasteful, tearful, thankful, thoughtful, trustful, uneventful, unmerciful, wasteful, useful
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