Fromdis- +‎accordant.

disaccordant (comparativemoredisaccordant,superlativemostdisaccordant)

1. (archaic) Notaccordant.
   • 1494, Robert Fabyan,Fabyan's Chronicle:

     It isdisacordaunt vnto other wryters.

• “disaccordant”, inWebster’s Revised Unabridged Dictionary, Springfield, Mass.:G. & C. Merriam,1913,→OCLC.