All 6 Uses

competent
in
Gone with the Wind
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There had always been friends, neighbors, the competent hands of willing slaves.†
Chpt 3.21

competent = sufficiently capable
He did them silently, patiently and competently.†
Chpt 3.30 *

competently = in a capable or adequate manner
He listened to her moans about lost customers and bad debts, the swindling ways of Mr. Johnson and the incompetency of Hugh.†
Chpt 4.38

incompetency = inability to do things sufficiently

standard prefix: The prefix "in-" in incompetency means not and reverses the meaning of competency. This is the same pattern you see in words like invisible, incomplete, and insecure.
Everybody in Atlanta who is smart is busy with his own affairs and the others are so incompetent and—†
Chpt 4.41

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.
Hugh was so incompetent, for all that he tried so hard.†
Chpt 4.41
They'll simply suffer in proud and incompetent silence.†
Chpt 4.43

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.