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