Answer:

diligent

Answer	Crossword Clue
DILIGENT	Assiduous
DILIGENT	Painstaking
DILIGENT	Painstaking.

DILIGENT	Unlike a slacker
DILIGENT	Sedulous
DILIGENT	Persevering

Crossword

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