stoical
unemotional
Laodicean
Olympian
Spartan
accepting
aloof
apathetic
armed with patience
at rest
benumbed
blah
blase
bovine
calm
cloistered
comatose
cool
desensitized
detached
disciplined
disinterested
dispassionate
dull
dwindling
ebbing
endurant
enduring
even-tempered
even-tenored
forbearing
halcyon
heartless
hebetudinous
hopeless
hushed
impassive
imperturbable
in a stupor
indifferent
indulgent
inexcitable
inirritable
insouciant
isolated
languid
lenient
lethargic
listless
long-suffering
longanimous
man of iron
adult
grownup
philosopher
bland
dour
fatalistic
implacable
indomitable
inscrutable
nonchalant
outward
placid
resolute
stolid
stony
uncomplaining
unconcerned
unflinching
unruffled
unshakable
unyielding
Cenozoic
Mesozoic
Paleozoic
dichroic
gabbroic
heroic