good-natured
temperate
accordant
alike
automatic
balanced
calm
collected
composed
consistent
consonant
constant
continuous
cool
correspondent
dispassionate
easygoing
equal
equivalent
even
even-tempered
flat
homogeneous
immutable
imperturbable
invariable
level
level-headed
levelheaded
measured
mechanical
methodic
methodical
monolithic
of a piece
ordered
orderly
peaceful
persistent
placid
regular
reposeful
robotlike
same
serene
smooth
stabile
affable
balmy
conciliatory
congenial
favourable
harmonious
peaceable
salubrious
sedate
self-possessed
self-restrained
sunshiny
tranquil
trustful
unclouded
uneventful
unruffled
untroubled
windless