UNFIXT is a playable word

unfix Scrabble® Dictionary

verb
unfixed or unfixt, unfixing, unfixes
to unfasten
27 Playable Words can be made from "UNFIXT"
   2-Letter Words (9 found)
   3-Letter Words (13 found)
   4-Letter Words (2 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)