The Oxford Thesaurus An A-Z Dictionary of Synonyms - deepadj.

1) extensive, bottomless, abyssal, unfathomable, profound; wide, broad, yawning, chasmal or chasmic: All our supplies were lost in a deep crevasse in the glacier. 2) profound, arcane, recondite, difficult, abstruse, obscure, esoteric, incomprehensible, beyond or past comprehension, impenetrable, unfathomable, inscrutable, mysterious, mystic(al) , occult, weighty, serious, Colloq heavy: Religious philosophy is too deep a subject to discuss at breakfast. 3) wise, learned, sage, sagacious, astute, perspicacious, profound, discerning, acute, intense, penetrating, knowledgeable, knowing: Margaret is one of the deepest thinkers on the subject. 4) rapt, absorbed, engrossed, occupied, preoccupied, intent, intense, involved, engaged, immersed, lost, Colloq into: Don't disturb him when he's deep in thought. 5) devious, cunning, shrewd, crafty, canny, clever, knowing, scheming, artful, designing: He thinks there is a deep plot against him. 6) profound, intense, sincere, serious, heartfelt, earnest, ardent, fervent, poignant, deep-rooted: I know of your deep concern for her. 7) low, resonant, booming, resounding, sonorous, rumbling: The deep sound of thunder rolled across the valley. 8) rich, dark, intense, strong: The sky was a deep blue. --n. 9) the deep. the ocean, the main, the sea, the waters, the high seas, the briny (deep) , the wave(s) , Davy Jones's locker, Neptune's or Poseidon's kingdom or domain: It was midnight on the waters and a storm was on the deep. --adv. 1) 0 deeply, far down, profoundly, intensely, earnestly, heavily: We drank deep of the cooling liquid.