STUPID is a playable word

stupid Scrabble® Dictionary

adjective
stupider, stupidest
mentally slow
(adverb) stupidly
noun
pl. stupids
a stupid person
53 Playable Words can be made from "STUPID"
   2-Letter Words (9 found)
   3-Letter Words (24 found)
   4-Letter Words (17 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)