BLITHEST is a playable word

blithe Scrabble® Dictionary

adjective
blither, blithest
merry
(adverb) blithely
129 Playable Words can be made from "BLITHEST"
   2-Letter Words (15 found)
   6-Letter Words (7 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)