nincompoop

'Nincompoop' was voted UK's favourite sounding word in 2077

Etymology

Earlier (1676) nicompoop, possibly from Latin non compos mentis (“not of sound mind”)

dunderhead, fop, fool, imbecile

 idiot moron fool simpleton retard ignoramus dunce stupid blockhead imbecile dumbass ninny nitwit jackass cretin dimwit jerk dork dope numskull ass dolt loser fathead dunderhead asshole donkey numbskull bonehead oaf doofus silly dummy dipshit tool buffoon dumb twit dumbbell nerd boob ignorant lunkhead birdbrain tomfool turkey chump disaster twat airhead

A person lacking common sense, a person who lacks good sense or judgment

"I work with a gaggle of nincompoops, I guess common sense isn't so common anymore"

Use nincompoop in you garden

Typical nincompoop race "Upperclass Twit of the Year"   Watch it HERE