deep

abstruse abstract abysmal abyssal alto bottomless bowels brine broadest bright brighter broad broader brightest cavernous cerebral cleverest clever concentrated contralto cunning darkest dark darker devout difficult engrossed engaged esoteric fainter faint far out far far foxy fruity groovy heartfelt heartiest hearty immersed impassioned impressive insidious intelligent intense intensive intent intimate learned long longest loudest loud louder low low-pitched lurid meaningful metaphysical middle midst more concentrated more impressive more intensive more meaningful more difficult more intelligent more philosophical more philosophical more philosophic more serious most philosophic most serious most philosophical most philosophical obscure obscure occult ocean over one's head overlong passionate philosophical/philosophic philosophical plangent preoccupied profound profound profound protracted psychical rapt recondite resonant resounding rich richest richer ringing roaring rooted ruminative sea secret serious shrewdest shrewd soulful sound subtle subtle thick thoughtful throaty tricky unbroken unfathomable unfathomable widest wide wilier wily