as cool as a cucumber

composed

kəmˈpəʊzd

adjective

having one’s feelings and expression under control; calm.

a very talented and composed young player

calm,collected,cool,and collected,as cool as a cucumber,cool-headed,controlled,self-controlled,serene,tranquil,relaxed,at ease,self-possessed,unruffled,unperturbed,unflustered,undisturbed,unmoved,unbothered,untroubled,unagitated,equable,even-tempered,level-headed,imperturbable,unflappable,unfazed,together,laid-back,chilled,nonplussed,equanimous

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collected

kəˈlɛktɪd

adjective

(of a person) calm and self-controlled.

outwardly they are cool, calm, and collected

calm,cool,and collected,as cool as a cucumber,cool-headed,self-possessed,composed,controlled,self-controlled,poised,serene,tranquil,relaxed,unruffled,unperturbed,unflustered,undisturbed,unagitated,unmoved,unbothered,untroubled,equable,even-tempered,imperturbable,placid,quiet,sedate,unexcitable,impassive,dispassionate,unemotional,phlegmatic,stolid,unflappable,unfazed,together,laid-back,nonplussed,equanimous

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