(of a person) controlled and not afraid, angry, excited etc

composed, calm

pleased with oneself or one's ability (and not caring about others)

contented

not easy troubled or excited

calm, collected

too confident

confident

having, showing patience; a person who has received or is receiving medical treatment

capable, willing to endure

calm; not easily annoyed

calm, mild

mentally healthy; sensible

mentally sound; reasonable

happy and calm

calm, undisturbed

serious and in control of oneself; not drunk; (of colours, tastes etc) ordinary and dull

not partaking of alcohol

(of a person, behaviour) not becoming excited or nervous during a crisis

cool and calm