Answer:

GREYEST

Answer	Crossword Clue
GREYEST	Cloudiest, in London
GREYEST	Most dreary and cloudy.
GREYEST	Dullest.

GREYEST	Most dismal, British style.
GREYEST	Most griseous
GREYEST	Most dreary
GREYEST	Most dull, in Dover
GREYEST	Cloudiest, in England

Crossword

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