Answer: dumber

AnswerCrossword Clue
DUMBERLess quick
DUMBERNot quite as bright
DUMBERNot as bright
DUMBERNot so clever
DUMBERMore ignorant
DUMBERMore dull-witted
dumberDUMB, incapable of speech
dumbersilent
dumbersilly or stupid
dumberlacking the power of speech (offensive when applied to humans)