deep

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