"questionable" | Definition and Related Words

Adjective

Subject to question (synset 301922610)
"questionable motives"; "a questionable reputation"; "a fire of questionable origin"

also: contestable - capable of being contested
similar to:
- alleged, so-called, supposed - doubtful or suspect
- apocryphal - being of questionable authenticity
- debatable, problematic, problematical - open to doubt or debate
- doubtful, dubious, dubitable, in question - open to doubt or suspicion
- equivocal - open to question
- fishy, funny, shady, suspect, suspicious - not as expected
- impugnable - subject to being discredited
- self-styled, soi-disant - as claimed by and for yourself often without justification
Able to be refuted (synset 300724815)
similar to: deniable - capable of being denied or contradicted

same as: confutable, confutative, refutable