EXAMPLES FROM THE WEB FOR INCOMPETENTLY
Several companies dishonestly and incompetently conducted have found it impossible to longer prey upon a too confiding public.
Think of the numbers that might be removed from the responsibility of incompetently educating!
I should wish even to enlarge them all: not that the Church of England is incompetently endowed.
1610s, "insufficient," from French incompétent, from Late Latin incompetentem (nominative incompetens) "insufficient," from in- "not" (see in- (1)) + Latin competentem (see competent). Sense of "lacking qualification or ability" first recorded 1630s. The noun meaning "incompetent person" is from 1866. Related: Incompetently.