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Definitions

questionable

[kwes-chuh-nuh-buhl] / ˈkwɛs tʃə nə bəl /
ADJECTIVE
doubtful, uncertain
Synonyms
STRONGEST
ambiguous arguable controversial debatable dubious problematic suspicious unproven vague
WEAK
apocryphal contingent controvertible cryptic disputable dubitable enigmatic equivocal fishy hard to believe hypothetical iffy indecisive indefinite indeterminate moot mysterious obscure occult open to doubt open to question oracular paradoxical problematical provisional shady suspect unconfirmed undefined under advisement under examination unreliable unsettled
Antonyms
STRONGEST
certain clear definite incontrovertible indubious sure trustworthy trusty undoubted unquestionable
WEAK
indisputable proven

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

As we see it, the bigger challenge facing Phreesia is the continuing repricing in the market toward these types of small-cap tech names with a questionable competitive moat.

From Barron's • Mar. 31, 2026

"Like certain communities are still a bit questionable about it, but it's definitely got better," said Kamara.

From BBC • Mar. 28, 2026

This is why comparing social media to tobacco is questionable: The scientific consensus on smoking’s harms is unanimous and no one claims smoking has benefits.

From The Wall Street Journal • Mar. 27, 2026

That food storage container that’s definitely filled with something… questionable?

From Salon • Mar. 19, 2026

Yet today I find it lying about where anyone of questionable character might take it for their own.”

From "The Name of the Wind" by Patrick Rothfuss

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.