incapaz
/inkaˈpaθ/ · B1 · adj
incapable, unable
in- (not) + capaz (capable) = incapable; capaz shares a root with capacity
From Latin incapax: in- (not) + capax (able to hold), from capere (to take). The Spanish -az is the English -able/-acious ending, as in capaz/capable and audaz/audacious. Plural: incapaces.