飞贼

飞贼	fēi zéi	cat burglar / burglar who gains entrance by scaling walls / intruding enemy airman / air marauder
飞	fēi	to fly
贼	zéi	thief; robber / (bound form) traitor; subversive / (bound form) evil; wicked / sly; shifty; devious / (literary) to harm; to injure / (coll.) extremely; insanely; damn (common in NE China and Taiwan)