Answer:

keenest

Answer	Crossword Clue
KEENEST	Most interested
KEENEST	Most perceptive
KEENEST	Most zealous

KEENEST	Most astute
KEENEST	Most acute
KEENEST	Most intense
KEENEST	Most enthusiastic
KEENEST	Most gung-ho
KEENEST	Most observant
KEENEST	Sharpest.
KEENEST	Most bitter.

KEENEST	Most sagacious.
KEENEST	Most perceptive.
KEENEST	Most eager.
KEENEST	Most intense.
KEENEST	Most insightful
KEENEST	Most sharp
KEENEST	Most clever
KEENEST	Least dull

KEENEST	Most eager
KEENEST	Sharpest
KEENEST	Acutest

Crossword

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