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questionable Antonyms

Opposite of questionable

Because the opposite of questionable shifts with each meaning, the 14 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

Open to doubt, dispute, or skepticism regarding truth, validity, or quality.

Usage Example

"The researcher's conclusions were based on unquestionable data from a very small sample size."

Strongest
unquestionable
indisputable
undeniable
certain
irrefutable
Strong
reliable
definite

• adjective (Context 2)

Giving cause for moral suspicion; potentially dishonest, improper, or disreputable.

Usage Example

"The auditing committee uncovered several reputable financial transactions made by the former executive."

Strongest
reputable
honorable
ethical
aboveboard
Strong
trustworthy
upright
legitimate

Similar words to questionable

Words similar to questionable shift depending on context. Common synonyms include:

dubious
doubtful
suspicious
debatable
suspect
shady
disputable
arguable
See all synonyms of questionable

• Nearby Words

quencher
query
question
questionable
questionably
questioner
questioning

Cite this Entry

Wordmom. (2026). Antonyms for Questionable. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/questionable
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