adv

• (archaic or regional, otherwise humorous) No.
  "Duke Magnus, Duke Magnus, plight thee to me, I pray you still so freely; Say me not nay, but yes, yes!"
• (archaic or regional) Introducing a statement, without direct negation.
  "Nay, what are you smiling at so damnably?"
• (archaic, otherwise humorous) Or rather, or should I say; moreover (introducing a stronger and more appropriate expression than the preceding one).
  "His face was dirty, nay, filthy."

intj

• (archaic) No.

noun

• (archaic) A denial; a refusal.
  "And my povert' no wight nor can nor may Make comparison, it is no nay."

verb

• (obsolete) To refuse.
  "the cardinall then being bishop of Winchester, tooke vpon him the state of cardinall, which was naied and denaied him, by the king of most noble memorie"