Answer: duller

AnswerCrossword Clue
DULLERLess interesting
dullerto make or become dull
dullernot bright
dullerstupid
dullernot lively
dullerboring; tedious
dullernot sharp
dullerDULL, mentally slow
DULLERMore like dishwater?
DULLERLess shiny
DULLERLess bright
DULLERLess sharp
DULLERMore insipid
DULLERMore boring
DULLERNot as bright
DULLERNot as sharp
DULLERMore like dishwater
DULLERNot so sharp