adjective

extending far down from the top or surface.

a deep gorge

extending far down,cavernous,yawning,gaping,huge,big,great,extensive,profound,unplumbed,bottomless,immeasurable,fathomless,unfathomable,chasmic

noun

the sea.

denizens of the deep

the sea,the ocean,the high seas,the drink,the briny,the waves,the main,the foam,the profound

adverb

far down or in; deeply.

he travelled deep into the forest

far down,far in,deep down,way down,to a great depth,far,a long way,a great distance,a good way