STIFFLY is a playable word

stiffly Scrabble® Dictionary

adverb
in a stiff manner
42 Playable Words can be made from "STIFFLY"
   2-Letter Words (6 found)
   3-Letter Words (13 found)
   4-Letter Words (14 found)
   5-Letter Words (8 found)
   7-Letter Words (1 found)