Answer:

astute

Answer	Crossword Clue
ASTUTE	Insightful
ASTUTE	Sharp as tacks
ASTUTE	Sharp as a tack

ASTUTE	Shrewd
ASTUTE	On the ball
ASTUTE	Very clever
ASTUTE	No dummy
ASTUTE	Very perceptive
ASTUTE	Sagacious
ASTUTE	Clever
ASTUTE	Perspicacious

ASTUTE	Sharp
ASTUTE	Keen
ASTUTE	Like Sherlock Holmes
ASTUTE	Quick on the uptake
ASTUTE	Savvy
ASTUTE	Perceptive
ASTUTE	Keenly perceptive
ASTUTE	Quite bright

ASTUTE	Eagle-eyed
ASTUTE	Mentally sharp
ASTUTE	Smart as a whip
ASTUTE	Perceptive; clever
ASTUTE	Not easily misled
ASTUTE	Tough to outwit
ASTUTE	Sharp-witted
ASTUTE	Very bright

ASTUTE	Quick
ASTUTE	Like some observations
ASTUTE	Really sharp
ASTUTE	Discerning
ASTUTE	Quick-thinking
ASTUTE	Very wise
ASTUTE	Word from the Latin for "cunning"
ASTUTE	Knowing

ASTUTE	Sagacious.
ASTUTE	Crafty.
ASTUTE	Shrewd.
ASTUTE	Wily.
ASTUTE	Cunning.