unruffled

/ˌən-ˈrə-fəld/

adjective

  1. poised and serene especially in the face of setbacks or confusion

  2. not ruffled : smooth

cool composed collected unruffled imperturbable nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness. composed implies freedom from agitation as a result of self-discipline or a sedate disposition.