n. 25B6; adjective
a deep ravine : CAVERNOUS, yawning, gaping, huge, extensive; bottomless, fathomless, unfathomable; archaic profound.
two inches deep : IN DEPTH, downwards, inwards, in vertical extent.
deep affection : INTENSE, heartfelt, wholehearted, deep-seated, deep-rooted; sincere, genuine, earnest, enthusiastic, great.
a deep sleep : SOUND, heavy, intense.
a deep thinker : PROFOUND, serious, philosophical, complex, weighty; abstruse, esoteric, recondite, mysterious, obscure; intelligent, intellectual, learned, wise, scholarly; discerning, penetrating, perceptive, insightful.
he was deep in concentration : RAPT, absorbed, engrossed, preoccupied, immersed, lost, gripped, intent, engaged.
a deep mystery : OBSCURE, mysterious, secret, unfathomable, opaque, abstruse, recondite, esoteric, enigmatic, arcane; puzzling, baffling, mystifying, inexplicable.
his deep voice : LOW-PITCHED, low, bass, rich, powerful, resonant, booming, sonorous.
a deep red : DARK, intense, rich, strong, bold, warm.
shallow, superficial, high, light.
(poetic/literary) creatures of the deep : THE SEA, the ocean; informal the drink; Brit. informal the briny; poetic/literary the profound.
the deep of night : THE MIDDLE, the midst; the depths, the dead, the thick.
I dug deep : FAR DOWN, way down, to a great depth.
he brought them deep into woodland : FAR, a long way, a great distance.