Roget's Thesaurus

#208. Depth

Nouns

depth; deepness etc. adj.; profundity, depression etc. (concavity) 252. hollow, pit, shaft, well, crater; gulf etc. 198; bowels of the earth, botttomless pit, hell. soundings, depth of water, water, draught, submersion; plummet, sound, probe; sounding rod, sounding line; lead. bathymetry. [instrument to measure depth] sonar, side-looking sonar; bathometer.

Verbs

be deep etc. adj.; render deep etc. adj.; deepen. plunge etc. 310; sound, fathom, plumb, cast the lead, heave the lead, take soundings, make soundings; dig etc. (excavate) 252.

Adjectives

deep, deep seated; profound, sunk, buried; submerged etc. 310; subaqueous, submarine, subterranean, subterraneous, subterrene; underground. bottomless, soundless, fathomless; unfathomed, unfathomable; abysmal; deep as a well; bathycolpian; benthal, benthopelagic; downreaching, yawning. knee deep, ankle deep.

Adverbs

beyond one's depth, out of one's depth; over head and ears; mark twine, mark twain.