noun
unwounded skin; unblemished skin
Rare standalone noun; almost always appears in the idiomatic phrase 完膚なきまで (thoroughly, leaving no room for doubt). The literal meaning is 'skin without injury'.
See also: 完膚なきまで
「完膚なきまでに論破する」という表現で使われる。
It is used in the expression 完膚なきまでに論破する (to argue someone down completely).
彼は完膚なきまでに打ちのめされた。
He was thoroughly beaten (figuratively).