way off

way off

Completely incorrect, mistaken, or misinformed. A: "I'd say there are probably 500 jellybeans in that jar!" B: "Nope, you're way off! There's 1,725." Tom is way off about Jenny if he thinks she's the type to rat us out.
See also: off, way
Farlex Dictionary of Idioms.

way off (base)

Inf. Fig. on the wrong track; completely wrong. I think you're way off base. Try again. Sorry. You are way off. You should just give up.
See also: off, way
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

way off

verb
See way off base
See also: off, way
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • off base
  • way off base
  • nope
  • miss the mark
  • (one) could be forgiven for (doing something)
  • (one) might be forgiven for (doing something)
  • off beam
  • off the beam
  • on the beam
  • begging your pardon, but (something)
References in periodicals archive
Weak demand for bank loans, however, made it clear the recovery was still some way off.