cool as a cucumber
imperturbability
settle
sile
keep one's head
keep one's cool
have one's wits about one
complacently
imperturbableness
coolness
self-possessedly
compose
calmen
composed
cucumber
self-possession
countenance
simmer down
cool off
settle down
easy
calm down
chill out
soft
cool it
calm
ice cool
easy does it
sedately
pour oil on troubled waters
hang tough
cowardly
fearful
cool
bestill
hose down
even-tempered
self-confidently
coolheaded
cool cat
crawlingly
even-mindedly
nerveless
soothe
plussed
heropanti
salve
ice-calm
keep one's knickers on
humblish
centered
humbly
equanimous
meekly
bear up
unconcern
undismayed
nonchalance
get ahold of oneself
vainly
pensiveness
orderly
indifference
presence of mind
untumultuous
loosen up
relax
decompress
resourcefulness
slow down
phlegm
unbend
take something in stride
pacifically
unwind
freeheartedly
placify
self-complacent
oleaginousness
keep one's hair on
unctuousness
fulsomeness
oiliness
unction
smarminess
comfortable in one's own skin
superior
tranquilizing
put on a brave face
serene
laid-back
down to a science
smug
sanely
smugly