unexplained Synonyms

not explained unaccounted unfamiliar unexplainable unexposed unidentified unfathomable undefined undetermined vague unknown unheard-of unapprehended unascertained untracked untraced unspied unsolved unrevealed unperceived unnoted uninvestigated unexplored undiscovered uncharted unaccountable strange incomprehensible incognito illegible foreign exotic enigmatical enigmatic concealed cacographic baffling anonymous indecipherable indeterminate puzzling paradoxical odd occult obscure nameless mystifying mysterious invisible inscrutable