
bekloppt
crazy / stupid
A colloquial, often derogatory expression for crazy, stupid, or nonsensical.
Er hat die bekloppte Idee, im Winter im See zu baden.
He has the crazy idea of swimming in the lake in winter.
crazy / stupid
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crazy / stupid
A colloquial, often derogatory expression for crazy, stupid, or nonsensical.
Er hat die bekloppte Idee, im Winter im See zu baden.
He has the crazy idea of swimming in the lake in winter.
'Bekloppt' (crazy/stupid) is a very informal colloquial word. It can be perceived as insulting and should therefore be avoided in formal or polite conversations.
Halt mich nicht für bekloppt, aber ich glaube, ich habe ein Gespenst gesehen.
Don't think I'm crazy, but I think I saw a ghost.
The word is figuratively derived from 'klopfen' (to knock). The idea is that someone has been knocked on the head so often that he or she can no longer think clearly.
Was für eine bekloppte Regelung, die versteht doch niemand!
What a stupid rule; nobody understands it!
The adjective 'bekloppt' (crazy/stupid) can describe both people and ideas, plans, or actions that one considers crazy or stupid.
Mein Nachbar ist total bekloppt, er mäht nachts den Rasen.
My neighbor is totally crazy; he mows the lawn at night.
stupid / annoying
Blöd and bekloppt can both be used to criticize a stupid or nonsensical action. Blöd can simply mean unwise; bekloppt sounds stronger and can portray the action as downright crazy. Blöd is therefore more suitable for mild criticism.

Es war völlig bekloppt, bei diesem Schneesturm ohne Jacke aus dem Haus zu gehen.
It was completely crazy to leave the house without a jacket in this snowstorm.
Es war blöd, ohne Jacke aus dem Haus zu gehen.
It was stupid to leave the house without a jacket.