immobile
adamant
adamantine
affectless
anchored
anesthetized
arctic
at a standstill
autistic
blunt
cast-iron
catatonic
chill
chilly
cold
cold as charity
cold-blooded
coldhearted
constant
cool
determined
dispassionate
dogged
dour
drugged
dull
emotionally dead
emotionless
fast
firm
fixed
flinty
frigid
frosted
frosty
frozen
grim
hard
hard-core
heartless
icy
immotile
immotive
immutable
impassible
impassive
implacable
impenetrable
imperturbable
impregnable
inscrutable
invincible
motionless
rigid
steadfast
stolid
stony
unchangeable
unchanging
unmoved
unmoving
unresponsive
unshaken
unyielding
approvable
movable
provable
removable