Looking at dictionary definintions between "humongous" and "profound", the first refers strictly to size, the later can include not only intelectual depth, but other terms that can be constuded to having geological implications. See 2a and 2b below.
From Merriam-Webster Online --
Full Definintion of PROFOUN
1a : having intellectual depth and insight
b : difficult to
fathom or understand
2a : extending far below the surface
b : coming from, reaching to, or situated at a depth
: deep-seated <a profound sigh>
3a : characterized by intensity of feeling or quality
b : all encompassing
: complete <profound sleep> <profound deafness>
Given the above, it would make sense that counsel would not approve use of the word "humongous", but find "profound" acceptable.
VP