Synonyms and related words :
able, abstruse, ambiguous, baffling, beguiling, bewildering, bothering, confounding, confusing, contradictory, cryptic, discomposing, disconcerting, dismaying, distracting, disturbing, embarrassing, enigmatic, enigmatical, exceptional, extraordinary, fabulous, fantastic, fascinating, incalculable, incognizable, incomprehensible, inconceivable, incredible, intricate, marvelous, miraculous, mysterious, mystifying, outlandish, passing strange, perplexing, perturbing, phenomenal, problematic, prodigious, rare, remarkable, riddling, sealed, sensational, sphinxlike, strange, striking, stupendous, unapparent, unapprehended, unascertained, unbeknown, uncharted, unclassified, undisclosed, undiscoverable, undiscovered, undivulged, unexplained, unexplored, unexposed, unfamiliar, unfathomed, unheard, unheard-of, unidentified, unimaginable, uninvestigated, unique, unknowable, unknown, unperceived, unplumbed, unprecedented, unrevealed, unsuspected, untouched, upsetting, virgin, wonderful, wondrous