That young Welsh nincompoop imp has his eyes everywhere; his ears are always open.
When ye hear of a man a woman hez made, ye hears of a nincompoop.
There are two kinds of sentimental warriors in this amorous world: the man and the nincompoop.
The nincompoop can always be counted on to deify the commonplace.
Wouldn't some nincompoop like Forsyth be perhaps, after all, his best choice?
At moments he showed extraordinary talent as an engineer; at others he behaved like a nincompoop.
The heavily-loaded wagon of the nincompoop and the virago was almost constantly mired.
And to think of her as the wife of that blithering little ass—that nincompoop of a Karl Brabetz!
And I won't have it spoiled, by every nincompoop poking his nose into it.
Gives up his pestle and mortar, and becomes a hopeless nincompoop for life.
1670s, nicompoop. Despite similarity [noted by Johnson] to Latin legal phrase non compos mentis "insane, mentally incompetent" (c.1600), the connection is denied by etymologists because the earliest forms lack the second -n-. Weekley thinks first element may be a proper name, and cites Nicodemus, which he says was used in French for "a fool," or Nicholas. Klein says probably an invented word.
A fool or stupid person (1676+)