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Definition of questionable:

  1. Admitting of being questioned; inviting, or seeming to invite, inquiry.
  2. Liable to question; subject to be doubted or called in question; problematical; doubtful; suspicious.


enigmatical, improbable, obscure, suspect, deniable, shaky, contingent, perplexing, wrong, discreditable, problematical, dubitable, provisional, roughly, ill-favored, likely, dodgy, deniable, soi-disant, enigmatic, chancy, far-fetched, refutable, certain, unsatisfactory, unlikely, undefined, fishy, in question, definite, fly-by-night, confutative, so-called, funny, equivocal, disappointing, approximate, doubtful, mootable, limited, unapt, dubious, inadequate, paradoxical, flimsy, honored, average, hypothetical, problematic, suspicious, inconclusive, issuable, imprecise, controvertible, ambiguous, incorrect, broadly, queer, debatable, apocryphal, honest, borderline, clouded, inaccurate, exceptionable, indistinct, inexact, alleged, illegitimate, impugnable, incredible, unsound, approximately, unsettled, confutable, oracular, self-styled, substandard, irregular, undoubted, poor, negotiable, occult, indefinite, inferior, shady, suboptimal, indeterminate, unclear, indecisive, doubtable, supposed, iffy, disagreeable, undistinguished, unpopular, dishonest, clear, cryptic, contested.

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