unknottable

adjective2

1. •
   Not knottable; in which a knot cannot be tied.

   • A Stoppered Coil is also the stow for unknottable items such as garden hose and wire rope. — 2009
2. •
   Able to be unknotted.

   • […] and finally the knot is reduced to those which are easily unknottable. — 2013