Dummkopf, blöder Mensch, Idiot
Nerd, also jerk.
A person who lacks good judgment; SYN. sap, saphead, muggins, tomfool.
ETYM French idiot, Latin idiota an uneducated, ignorant, ill-informed person, Greek idioths, also and orig., a private person, not holding public office, from idios proper, peculiar. Related to Idiom.
A person of subnormal intelligence; SYN. imbecile, cretin, moron, changeling, half-wit, retard.
A stupid or unimportant person; dolt
(Yiddish) a gullible simpleton more to be pitied than despised