con comme la Lune

Senso (Inglese)

1. (vulgar) Very stupid; thick as two short planks; dumb as a doorknob
2. (rare, vulgar) Extremely easy or simple; easy as pie

sinonimi

con comme un balai

con comme une valise

con comme un manche

Etimologia (Inglese)

Literally, “dumb/thick as the Moon”.