Nitwit
来自Big Physics
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early 20th century: apparently from nit1 + wit1.
wiktionary
First attested in the 1910s in the US Northeast. Likely from German nit, dialectal form of nichts(“nothing”), or Yiddish ניט (nit), dialectal form of נישט (nisht, “no”), although some dictionaries give the alternative etymology nit(“louse egg; something very small”) + wit.
etymonline
nitwit (n.)
also nit-wit, "stupid person," by 1914, American English slang, probably from nit "nothing," from dialectal German or Yiddish, from Middle Low German (see nix (n.)) + wit (n.). Related: Nitwitted; nitwittery.
