DULLED is a playable word

dull Scrabble® Dictionary

adjective
duller, dullest
mentally slow
verb
dulled, dulling, dulls
to make less sharp
18 Playable Words can be made from "DULLED"
   2-Letter Words (3 found)
   3-Letter Words (8 found)
   4-Letter Words (6 found)
   6-Letter Words (1 found)