Questionable
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wiktionary
question + -able
etymonline
questionable (adj.)
1580s, "that may be interrogated" (a sense now obsolete); c. 1600, of facts, claims, etc., "open to dispute, doubtful," from question (v.) + -able. Deprecatory sense of "dubious in character" is attested from 1806. Related: Questionably.
