adjective

1. very deep or low a profound abyss, sleep, etc.
2. marked by intellectual depth a profound discussion
3. intensely felt profound grief
4. thoroughgoing profound changes
5. unbroken a profound silence

Etymology: ME < OFr profund < L profundus < pro-, forward (see pro-) + fundus, bottom

noun

1. Archaic an abyss or deep, as of the ocean
2. something profound