STOLID is a playable word

stolid Scrabble® Dictionary

adjective
stolider, stolidest
showing little or no emotion
(adverb) stolidly
77 Playable Words can be made from "STOLID"
   2-Letter Words (13 found)
   3-Letter Words (21 found)
   5-Letter Words (11 found)
   6-Letter Words (1 found)