not in a thousand years

not in a thousand years

Not at any point; under absolutely no circumstances. Not in a thousand years did I think that I would actually win the lottery! A: "Would you ever go on a date with Jake?" B: "Ew, no, not in a thousand years!"
See also: not, thousand, year
Farlex Dictionary of Idioms.

Not in a thousand years! and Never in a thousand years!

Fig. No, never! John: Will you ever approve of her marriage to Tom? Sue: No, not in a thousand years! Mary: Will all this trouble ever subside? John: Never in a thousand years!
See also: and, never, not, thousand
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

not/never in a hundred, etc. ˈyears

(spoken) used to emphasize that you will/would never do something: I’d never have thought of that in a million years.
See also: never, not, year
Farlex Partner Idioms Dictionary
See also:
  • not for a second
  • not for a minute
  • not for a moment
  • not for a instant
  • not for a/one minute/moment/second/instant
  • not by any means
  • by no means
  • hope not
  • (I) hope not
  • ain't