hard to understand

bewildering confusing enigmatic incomprehensible mystifying perplexing unfathomable

abstruse beyond one difficult to understand over one's head unclear

clear comprehensible fathomable

acute complex difficult heavy hidden profound serious

occult secret wise

Delphic abstruse arcane concealed discerning esoteric hermetic incisive intricate learned mysterious obscure orphic penetrating recondite sagacious sibylline

simple stupid trivial unimportant

frivolous shallow superficial unintelligent

baffling bewildering beyond comprehension beyond one complex complicated deep incomprehensible profound unfathomable