DUMBED is a playable word

dumb Scrabble® Dictionary

adjective
dumber, dumbest
lacking intelligence
verb
dumbed, dumbing, dumbs
to make silent
22 Playable Words can be made from "DUMBED"
   2-Letter Words (7 found)
   3-Letter Words (11 found)
   4-Letter Words (3 found)
   6-Letter Words (1 found)