UNTREADING is a playable word

untread Scrabble® Dictionary

verb
untrod or untreaded, untrodden, untreading, untreads
to tread back
601 Playable Words can be made from "UNTREADING"
   2-Letter Words (26 found)
   3-Letter Words (95 found)
   9-Letter Words (2 found)
   10-Letter Words (2 found)