infidel (noun) infidel: nonbeliever
Sinonime: Delphic, Greek, baffling, beats me, beyond comprehension, beyond one's grasp, clear as mud,
cryptic, enigmatic, fathomless,
impenetrable, incognizable,
inconceivable, inscrutable, mysterious, mystifying, obscure,
opaque, over one's head,
perplexing, puzzling, sibylline,
unclear, unfathomable, ungraspable,
unimaginable, unintelligible, unknowable
Antonime: comprehensible, fathomable, intelligible, understandable