Answer:

CRASSEST

Answer	Crossword Clue
CRASSEST	Maximally unrefined
CRASSEST	Least refined
CRASSEST	Having the least refinement

CRASSEST	Most insensitive
CRASSEST	Most loutish
CRASSEST	Most inelegant
CRASSEST	Crude to the max

Crossword

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