collected

cool, composed, collected, unruffled, imperturbable, nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness.

• • kept a cool head

composed implies freedom from agitation as a result of self-discipline or a sedate disposition.

• • the composed pianist gave a flawless concert

collected implies a concentration of mind that eliminates distractions especially in moments of crisis.

• • the nurse stayed calm and collected

unruffled suggests apparent serenity and poise in the face of setbacks or in the midst of excitement.

• • harried but unruffled

imperturbable implies coolness or assurance even under severe provocation.

• • the speaker remained imperturbable despite the heckling

nonchalant stresses an easy coolness of manner or casualness that suggests indifference or unconcern.

• • a nonchalant driver