profound
pruh-FOUNDadjMeaning very deep in thought, feeling or effect
Memory hook PRO-FOUND: FOUND at the very bottom. Professor Edwin climbs down to the deepest part of the cave and finds a glowing gem no one else ever reached; a thought that comes from that deep is profound.
Grandma’s quiet advice had a profound effect on how I treat my friends.
In context Though the child spoke in simple words, her answer was profound; the room fell silent as the grown-ups realized she had seen to the heart of the problem.
Similar deep, insightful, intense, wise
Opposite superficial, shallow, trivial
From Latin profundus, “deep”: pro- (forward, down) + fundus (bottom).