define profound effect
Wiktionary(1.00 / 1 vote)Rate this definition: 1  profound(Noun) The deep; the sea; the ocean. 2  profound(Noun) An abyss. 3  profound(Verb) To cause to sink deeply; to cause to dive or penetrate far down.  profound(Verb) To dive deeply; to 1  penetrate. profound(Adjective) Descending far below the surface; opening or reaching to a great depth; deep.