STERNLY is a playable word

sternly Scrabble® Dictionary

adverb
in a stern manner
83 Playable Words can be made from "STERNLY"
   2-Letter Words (9 found)
   3-Letter Words (27 found)
   5-Letter Words (13 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)