The Oxford Thesaurus An A-Z Dictionary of Synonyms - depth n.

1) deepness, extent, measure, profundity, profoundness: The depth of the cavern was at least three miles. 2) profundity, profoundness, abstruseness, obscurity, reconditeness, complexity, intricacy: There is great depth of meaning in many proverbs. 3) profundity, wisdom, sagacity, sageness, understanding, perception, astuteness, perspicacity, perspicaciousness, insight, intuition, acumen, penetration: One would scarcely characterize Mickey Mouse as possessed of great depth. 4) intensity, profundity, strength; vividness, brilliance, brilliancy, brightness, richness: It is hard for me to express the depth of my feeling for you. The depth of colour is much better in this picture. 5) depths. deep(s) , abyss, abysm, chasm, bowels of the earth, (bottomless) pit, nethermost reaches or regions, nadir: As we descended into the depths the temperature increased. She is in the depths of despair and needs your moral support. 6) in depth. thoroughly, comprehensively, in detail, profoundly, deeply, extensively, intensively, concentratedly, probingly: The specialists have looked into the problem in depth and have no answer yet.