profound

"a profound silence"; "a state of profound shock";

"the fundamental revolution in human values that has occurred"; "the book underwent fundamental changes"; "committed the fundamental error of confusing spending with extravagance"; "profound social changes";

"a profound sigh";

"a heavy sleep"; "fell into a profound sleep"; "a sound sleeper"; "deep wakeless sleep";

"the profound depths of the sea"; "the dark unfathomed caves of ocean"; "unplumbed depths of the sea"; "remote and unsounded caverns";

"the differences are profound"; "a profound insight"; "a profound book"; "a profound mind"; "profound contempt"; "profound regret";