DULLNESS is a playable word

dullness Scrabble® Dictionary

noun
pl. dullnesses
the state of being dull
97 Playable Words can be made from "DULLNESS"
   2-Letter Words (9 found)
   3-Letter Words (23 found)
   6-Letter Words (6 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)