CALM
Unperturbed Self-controlled
I am very tranquil about it
I am not at all solicitous about it
He generally takes things with equanimity
He kept a calm exterior in emergencies
Magnificent reserve
You could scarcely observe any of the evidences of inward perturbation
With the utmost composure
With stoical calm
With remarkable equanimity
No harm can come from stating calmly the reasons that——
He wears an unruffled front
Without the flick of an eyelid
An air of quiet, unaffected assurance