Synonyms for deep

noun a long steep-sided depression in the ocean floor

adjective relatively deep or strong; affecting one deeply

adjective marked by depth of thinking

adjective having 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

adjective very distant in time or space

adjective intense or extreme

adjective having or denoting a low vocal or instrumental range

adjective strong; intense

adjective relatively thick from top to bottom

adjective extending relatively far inward

adjective (of darkness) densely dark

adjective large in quantity or size

adjective with head or back bent low

adjective of an obscure nature

adjective difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge

adjective exhibiting great cunning usually with secrecy

adverb to a great depth; far down or in

adverb to an advanced time