As an adjective unfull
is not full or complete; incomplete; imperfect.
As a verb unfill is
(obsolete) to empty.
unfill
English
Verb
(
en verb)
(obsolete) To empty
*1606 - , act ii, scene 2
*:I'll pierce him to his face; he shall die looking upon me. Thy veins are swell'd with lust; this shall unfill 'em