unemotional
aloof
apathetic
arid
at rest
barren
blunt
bored
bovine
calm
careless
cloistered
cool
dense
detached
disinterested
dispassionate
distant
doltish
dry
dull
dumb
dwindling
earthbound
ebbing
even-tempered
even-tenored
fact
foolish
halcyon
heedless
hushed
impassive
imperturbable
inactive
incurious
indifferent
inert
inexcitable
infecund
infertile
inirritable
insouciant
isolated
lethargic
listless
literal
lumpish
mindless
bland
good-natured
grim
haughty
immovable
phlegmatic
placid
resolute
sedate
stoic
stoical
sullen
unmoved
unruffled
solid
squalid