unflustered
1. [ adjective ] free from emotional agitation or nervous tension
Synonyms: unperturbed unruffled unflurried
Examples:

"the waiters were unflurried and good natured" "with contented mind and unruffled spirit"- Anthony Trollope

Related terms: composed
Similar spelling:   unpleated
  unplanted
  unblessed
  unifoliate
  unvalued
  unvoluntary
  unflurried
  unploughed
  unfluctuating
  unflavored