(of a person) showing no sign of feeling

aloof, cool

not easy troubled or excited

calm, collected

having no interest or opinion; neither for nor against

unfeeling, uninterested

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

capable, willing to endure

having or showing acceptance (of something unpleasant)

enduring, passive

happy and calm

calm, undisturbed

a person with great self-control when suffering difficulties, pain etc

philosophic

not social; outside the usual working day

unfeeling, uninterested