Very calm and relaxed.
とても落ち着いてリラックスしている。 (totemo ochitsuite rirakkusu shiteiru)
"Even in stressful situations, she stays as cool as a cucumber."
"ストレスのある状況でも、彼女はとても落ち着いている。" (sutoresu no aru jokyo demo kanojo wa totemo ochitsuiteiru)
undecided or unsure about something
to continue doing something as planned
in very good health
to argue or stop being friends with someone
very pleased or delighted
to accuse someone of being responsible for something bad.