All 3 Uses

competent
in
Girl Interrupted
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Their innocence and incompetence aroused our pity, unlike the incompetence of aides, which aroused our scorn.†
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incompetence = inability to do things sufficiently

standard prefix: The prefix "in-" in incompetence means not and reverses the meaning of competence. This is the same pattern you see in words like invisible, incomplete, and insecure.
Their innocence and incompetence aroused our pity, unlike the incompetence of aides, which aroused our scorn.†
This was partly because student nurses stayed only a few weeks, whereas aides were incompetent for years at a stretch.†

incompetent = not sufficiently capable

standard prefix: The prefix "in-" in incompetent means not and reverses the meaning of competent. This is the same pattern you see in words like invisible, incomplete, and insecure.

Definitions:

(1) (competent)
capable (able to do something in a generally satisfactory manner) -- sometimes specifically to have legal capability
(2) (meaning too rare to warrant focus)
In the field of law, competent has the specialized meaning of being legally qualified to do something such as to be mentally fit to make reasonable decisions; or to have jurisdiction or authority to take an action.

In classic literature, a competency can refer to having an income or assets to support living expenses.