composed

US /kəmˈpoʊzd/
UK /kəmˈpoʊzd/
1.

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

:
•
a very talented and composed young player
:
calmcollectedcoolas cool as a cucumbercoolheadedcontrolledserenetranquilrelaxedat easeself-possessedunruffledunperturbedunflusteredundisturbedunmovedunbothereduntroubledequableeven-temperedlevelheadedimperturbableunflappableunfazedtogetherlaid-backchillednonplussedequanimous
:
excitedoverwrought
:
composercompose