"Con" (Feminin=conne) means "idiot", but it's as bad a word as "bastard".

When the idiocy is double with meaness you can extend it to "connard / connasse".

You can also say "C'est trop con" as "It's too bad" (that something didn't happen, ie).

There are a few options too :

Petit con / Petite conne = Little "con" (idiocy + childish meaness)
Grand con / Grande conne = Tall "con" (idiocy + idiocy, but kind)
Gros con / Grosse conne = Fat "con" (idiocy + annoying)
Vieux con / Vieille conne = Old "con" (idiocy + meaness + age)
Sale con / Sale conne = Dirty "con" (idiocy + meaness)
Pauvre con / Pauvre conne = Poor "con" (hopeless idiocy)

Ponrauil