Albert Barnes Commentary Ezekiel 31:18

"To whom art thou thus like in glory and in greatness among the trees of Eden? yet shalt thou be brought down with the trees of Eden unto the nether parts of the earth: thou shalt lie in the midst of the uncircumcised, with them that are slain by the sword. This is Pharaoh and all his multitude, saith the Lord Jehovah." — Ezekiel 31:18 (ASV)

Application to Pharaoh.

The uncircumcised — The Egyptians, at least their nobles, were circumcised. Pharaoh should thus be dishonored with those whom the Egyptians themselves deemed unclean.