questionable

UK: /ˈkwɛstʃənəbəl/ US: /ˈkwɛstʃənəbəl/ ,(kwes′chə nə bəl)

WordReference Random House Learner's Dictionary of American English © 2025

ques•tion•a•ble /ˈkwɛstʃənəbəl/   adj. 

1. not completely honest, moral, respectable, or proper;
   dubious:
   He was accused of some questionable activities.
2. open to question.

See -ques-.

WordReference Random House Unabridged Dictionary of American English © 2025

ques•tion•a•ble  (kwes′chə nə bəl), adj. 

1. of doubtful propriety, honesty, morality, respectability, etc.:
   questionable activities; in questionable taste.
2. open to question or dispute;
   doubtful or uncertain:
   a statement of questionable accuracy.
3. open to question as to being of the nature or value suggested:
   a questionable privilege.

• question + -able 1580–90

ques′tion•a•ble•ness, ques′tion•a•bil′i•ty, n. 
ques′tion•a•bly, adv. 
Synonyms

• 2. debatable, disputable, controvertible, dubitable, dubious.

Antonyms

• 1. certain.

Collins Concise English Dictionary © HarperCollins Publishers::

questionable / ˈkwɛstʃənəb^əl/ adjective

1. (esp of a person's morality or honesty) admitting of some doubt; dubious
2. of disputable value or authority

ˈquestionableness, ˌquestionaˈbility noun

ˈquestionably adverb