Synonyms of the word

questionable

• adj. (obsolete) Inviting questions; inviting inquiry.
• adj. Problematic; open to doubt or challenge.
• adj. Of dubious respectability or morality.

alleged

• v. simple past tense and past participle of allege.
• adj. Asserted but not proved.
• adj. Supposed but doubtful.

apocryphal

• adj. Of, or pertaining to, the Apocrypha.
• adj. Of doubtful authenticity, or lacking authority; not regarded as canonical.
• adj. Of dubious veracity; of questionable accuracy or truthfulness; anecdotal or in the nature of an urban…

confutable

• adj. (archaic or formal) That can be confuted, i.e. shown to be false; disprovable.

confutative

• adj. That confutes.

contestable

• adj. That which can be contested.

debatable

• adj. Controversial. Not fully proved, open to debate, sometimes used humorously.
• adj. Of a person, argumentative.
• adj. A fitting subject for debate.

deniable

• adj. Able to be denied or contradicted.

doubtful

• adj. Subject to, or causing doubt.
• adj. Experiencing or showing doubt, sceptical.
• adj. Undecided or of uncertain outcome.
• adj. (obsolete) Fearsome, dreadful.
• adj. Improbable or unlikely.
• adj. Suspicious, or of dubious character.
• adj. Unclear or unreliable.
• n. A doubtful person or thing.

dubious

• adj. Arousing doubt; questionable; open to suspicion.
• adj. In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided.

dubitable

• adj. Capable of being doubted; susceptible of being questioned.

equivocal

• n. A word or expression capable of different meanings; an ambiguous term; an equivoque.
• adj. Having two or more equally applicable meanings; capable of double or multiple interpretation; ambiguous;…
• adj. Capable of being ascribed to different motives, or of signifying opposite feelings, purposes, or characters;…
• adj. Uncertain, as an indication or sign; doubtful, incongruous.

fishy

• n. (childish) diminutive of fish.
• adj. Of, from, or similar to fish.
• adj. Suspicious; inspiring doubt.
• adj. (LGBT slang) Of drag queens: appearing feminine.

funny

• adj. Amusing; humorous; comical.
• adj. Strange or unusual, often implying unpleasant.
• n. (humorous) A joke.
• n. (humorous) A comic strip.
• n. (Britain) A narrow boat for sculling.

impugnable

• adj. That can be impugned; open to (verbal) attack, open to question.

problematic

• adj. Posing a problem; having or suffering from problem(s).
• n. (chiefly in the plural) A problem or difficulty in a particular field of study.

problematical

• adj. doubtful or disputed.
• adj. dubious or ambiguous.

refutable

• adj. Able to be refuted, or shown to be false.

self-styled

• adj. Claimed by the recipient, as a title one gave to oneself.

shady

• adj. Abounding in shades.
• adj. Causing shade.
• adj. Overspread with shade; sheltered from the glare of light or sultry heat.
• adj. (informal) Not trustworthy; disreputable.
• adj. (Britain, slang) Mean, cruel.

so-called

• adj. (idiomatic) So named, but wrongly so.
• adj. (mathematics, sciences) So named.

soi-disant

• adj. Self-styled; self-proclaimed.
• adv. supposedly.

supposed

• v. simple past tense and past participle of suppose.
• adj. Presumed to be true, but without proof.
• adj. (with infinitive) Generally considered or expected.
• adj. (with infinitive) Having an obligation.
• adj. (with infinitive) Intended.

suspect

• v. (transitive) To imagine or suppose (something) to be true, or to exist, without proof.
• v. (transitive) To distrust or have doubts about (something or someone).
• v. (transitive) To believe (someone) to be guilty.
• v. (intransitive) To have suspicion.
• v. (transitive, obsolete) To look up to; to respect.
• n. A person who is suspected of something, in particular of committing a crime.
• adj. Viewed with suspicion; suspected.
• adj. (nonstandard) Viewing with suspicion; suspecting.

suspicious

• adj. Arousing suspicion.
• adj. Distrustful or tending to suspect.
• adj. Expressing suspicion.