SULLEN is a playable word

sullen Scrabble® Dictionary

adjective
sullener, sullenest
showing a brooding ill humor or resentment
(adverb) sullenly
32 Playable Words can be made from "SULLEN"
   2-Letter Words (7 found)
   3-Letter Words (12 found)
   4-Letter Words (8 found)
   5-Letter Words (3 found)
   6-Letter Words (2 found)