Answer:

deader

Answer	Crossword Clue
DEADER	More of a bore
DEADER	Doornail comparative
DEADER	Less stimulating

DEADER	Less lively, as a baseball
DEADER	More monotonous.
DEADER	More exhausted: Colloq.
DEADER	More tired
DEADER	More like a doornail?
DEADER	Less lively
DEADER	Like a doornail, only more so
DEADER	More deserted

DEADER	... than a doornail

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.