ETYM From Deep; akin to Dutch diepte, Icel. dypt, dypth, Goth. diupitha.
1. Extent downward or backward or inward.
2. (Usually plural) The deepest and most remote part.
3. (Usually plural) A low moral state.
4. Degree of psychological or intellectual depth.

ETYM Latin penetratio: cf. French pénétration.
1. The act of forcing a way into or through something.
2. Clear or deep perception of a situation; SYN. insight.
3. An attack that penetrates into enemy territory; SYN. incursion.
4. The act (by a man) of inserting his penis into the vagina of a woman.

ETYM Latin profunditas: cf. French profondite. Related to Profound.
Intellectual depth; penetrating knowledge; keen insight; etc: SYN. profoundness.