Translation of "dement" into English

Dacă tipul ăsta e asasinul dement de care spune Blakelock... de ce ne-ar da ruta sa?

I mean, if this guy's the mad-dog killer Blakelock says why would he supply us with his route?

A fost singurul pilot suficient de dement ca să accepte.

He was the only one crazy enough to do it.

Bineînteles, Ben ar alege un clown dement în locul petrecerii ăsteia grozave.

Of course, Ben would choose a demented clown over this amazing party.