profound
adjective
°Descending far below the surface; opening or reaching to a great depth; deep.
"A gulf profound. John Milton."
°Very deep; very serious.
noun
°(obsolete) The deep; the sea; the ocean.
°(obsolete) An abyss.
verb
°(obsolete) To cause to sink deeply; to cause to dive or penetrate far down.
°(obsolete) To dive deeply; to penetrate.