Definition of "nicompoop"

Yes, you Nicompoop, you are a pretty Fellow to pleaſe a Woman indeed.

1673, Tho[mas] Shadwell, Epsom-Wells. A Comedy, […], London: […] J[ohn] M[acock] for Henry Herringman […], Act II, scene i, page 28

[S]hall I be call'd as many blockheads, numſculs, doddypoles, dunderheads, ninnyhammers, gooſecaps, joltheads, nicompoops, and ſ—t-a-beds—and other unſavory appelations, [...]

1767, [Laurence Sterne], chapter XXV, in The Life and Opinions of Tristram Shandy, Gentleman, volume IX, London: […] T. Becket and P. A. Dehondt, […], page 99

[H]ad he dropped it [a hat] like a gooſe—like a puppy—like an aſs—or in doing it, or even after he had done, had he looked like a fool,—like a ninny—like a nicompoop—it had failed, and the effects upon the heart had been loſt.

1787 November, “Explanation of the Fifth Plate of Tristram Shandy. Corporal Trim’s Reflections on Mortality in the Kitchen, on the Death of Master Bobby.”, in The Gentleman’s and London Magazine: Or Monthly Chronologer, Dublin: Printed by John Exshaw, page 589, column 2

Because of this situation, you find the idlers, the never-do-wells, the nicompoops, the unqualified and the misfits these days getting on better in life than their hardworking colleagues.

1965, Marius Nkwoh, Bribery and Corruption: Bane of Our Society, Aba, Abia, Nigeria: International Press, page 110