deep, abysmal, mysterious, solemn, abstruse, heavy, erudite, scholarly, recondite, learned, undisturbed, heartfelt, intense, penetrating, great, consummate, enlightened, discerning, comprehensive, fathomless, serious
shallow, slight, superficial, unsettled, simple, trifling, unlearned, unenlightened, absurd, frivolous, fatuous
