DAFT

( -er, -est), [informal] daffy [adjective] [informal] - silly or stupidYou daft idiot!Driving the wrong way down a one-way street was a fairly daft thing to do.Don't be daft - let me pay - you paid last time.Some of the suggested solutions to the problem were unusual - others were just plain daft (= very silly)!He's (as) daft as a brush (= very silly)!