Answer:

harden

Answer	Crossword Clue
HARDEN	Calcify
HARDEN	Freeze or gel
HARDEN	Bearded James of the NBA

HARDEN	Set
HARDEN	Make unemotional
HARDEN	Become pitiless
HARDEN	Gel
HARDEN	Set, as concrete
HARDEN	Get tough
HARDEN	Set, as cement
HARDEN	Make tougher

HARDEN	Become rigid
HARDEN	1929 Nobel prize winner in chemistry.
HARDEN	Set.
HARDEN	Solidify
HARDEN	Become callous
HARDEN	Make firm
HARDEN	Fortify
HARDEN	Bake, perhaps

HARDEN	Become less sympathetic