Synonyms for deep

adjective

• of an obscure nature
• (of darkness) densely dark
• difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
• strong; intense
• having or denoting a low vocal or instrumental range
• exhibiting great cunning usually with secrecy
• extending relatively far inward
• 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
• intense or extreme
• large in quantity or size
• marked by depth of thinking
• relatively deep or strong; affecting one deeply
• relatively thick from top to bottom
• very distant in time or space
• with head or back bent low

adverb

• to an advanced time
• to a great depth; far down or in

noun

• a long steep-sided depression in the ocean floor
• literary term for an ocean
• the central and most intense or profound part

• to a great distance