No wonder that Chauvelin's spies had failed to detect, in the apparently brainless nincompoop, the man whose reckless daring and resourceful ingenuity had baffled the keenest French spies.
() Earlier (1676) nicompoop, possibly from Latin non compos mentis (“not of sound mind”), although the lack of the second n in the early form and the original meaning of “fop” cast doubt on this origin.