UNSTEADIEST is a playable word

unsteady Scrabble® Dictionary

adjective
unsteadier, unsteadiest
verb
unsteadied, unsteadying, unsteadies
to make not firm or stable
729 Playable Words can be made from "UNSTEADIEST"
   2-Letter Words (26 found)
   3-Letter Words (82 found)
   10-Letter Words (3 found)
   11-Letter Words (1 found)