Synonyms to unheard-of

able, adapted, adequate, adjusted, alert, au fait, brainy, brilliant, capable, checked out, clever, competent, effective, effectual, efficacious, efficient, enigmatic, enterprising, equal to, expert, fit, fitted, fitted for, go-ahead, good, incalculable, incognizable, intelligent, journeyman, keen, mysterious, productive, proficient, proper, puzzling, qualified, sealed, sharp, skilled, skillful, smart, strange, suited, unapparent, unapprehended, unascertained, unbeknown, uncharted, unclassified, undisclosed, undiscoverable, undiscovered, undivulged, unexplained, unexplored, unexposed, unfamiliar, unfathomed, unheard, unidentified, uninvestigated, unknowable, unknown, unperceived, unplumbed, unrevealed, unsuspected, untouched, up to, up to snuff, up-and-coming, virgin, well-fitted, well-qualified, well-suited, wicked, worthy, obscure, Cimmerian, abstruse, adiaphanous, adumbrate, aleatoric, aleatory, ambiguous, amorphic, amorphous, amphibological, anarchic, anonymous, apply to, arcane, around the bush, back of beyond, baffling, baggy, bandage, beamless, beat about, becloud, beclouded, bedarken, bedaz