calm
composed
accordant
alike
at rest
automatic
balanced
cloistered
collected
consistent
consonant
constant
continuous
cool
correspondent
downy
dwindling
ebbing
equable
equal
even
even-tenored
flat
glabrate
glabrescent
glabrous
halcyon
homogeneous
hushed
immutable
impassive
imperturbable
invariable
isolated
leiotrichous
level
measured
mechanical
methodic
moldering
monolithic
nonchalant
of a piece
ordered
orderly
pacific
peaceable
peaceful
persistent
bland
businesslike
emotionless
inscrutable
placid
sedate
self-possessed
stoic
stoical
stolid
unaffected
unconcerned
unemotional
uneventful
unhurried
unmoved
unperturbed
unshaken
untroubled
muffled
reshuffled
ruffled
scuffled
shuffled