Opposite words for yes:
nay, no, scarcely, no way.
Usage samples:
  1. " Well, I don't know- yes, I think I do.
    "Rose of Dutcher's Coolly", Hamlin Garland.
  2. But if you don't mind-" " Yes, Mr. Malone?"
    "Out Like a Light", Gordon Randall Garrett.
  3. Oh, yes, I 'member now!
    "The Marrow of Tradition", Charles W. Chesnutt.
  4. Yes;- I have done that.
    "An Eye for an Eye", Anthony Trollope.