Open English Wordnet

(n)deepthe central and most intense or profound part“in the deep of night”, “in the deep of winter”

(a)deeprelatively deep or strong; affecting one deeply“a deep breath”, “a deep sigh”, “deep concentration”, “deep emotion”, “a deep trance”, “in a deep sleep”

(a)deephaving great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination“a deep well”, “a deep dive”, “deep water”, “a deep casserole”, “a deep gash”, “deep massage”, “deep pressure receptors in muscles”, “deep shelves”, “a deep closet”, “surrounded by a deep yard”, “hit the ball to deep center field”, “in deep space”, “waist-deep”

(s)deepmarked by depth of thinking“deep thoughts”, “a deep allegory”

(s)deepvery distant in time or space“deep in the past”, “deep in enemy territory”, “deep in the woods”, “a deep space probe”

(s)deepintense or extreme“in deep trouble”, “deep happiness”

(s)bass, deephaving or denoting a low vocal or instrumental range“a deep voice”, “a bass voice is lower than a baritone voice”, “a bass clarinet”

(s)deep, richstrong; intense“deep purple”, “a rich red”

(s)deeprelatively thick from top to bottom“deep carpets”, “deep snow”

(s)thick, deep(of darkness) densely dark“thick night”, “thick darkness”, “a face in deep shadow”, “deep night”

(s)cryptic, cryptical, deep, inscrutable, mysterious, mystifyingof an obscure nature“the new insurance policy is written without cryptic or mysterious terms”, “a deep dark secret”, “the inscrutable workings of Providence”, “in its mysterious past it encompasses all the dim origins of life” (Rachel Carson), “rituals totally mystifying to visitors from other lands”

(s)abstruse, deep, reconditedifficult to penetrate; incomprehensible to one of ordinary understanding or knowledge“the professor's lectures were so abstruse that students tended to avoid them”, “a deep metaphysical theory”, “some recondite problem in historiography”

(s)deepexhibiting great cunning usually with secrecy“deep political machinations”, “a deep plot”

(r)deeply, deepto a great depth; far down or in“dived deeply”, “dug deep”

(r)deep, lateto an advanced time“deep into the night”, “talked late into the evening”

(r)deepto a great distance“penetrated deep into enemy territory”, “went deep into the woods”