self-assured
1. [ adjective ] showing poise and confidence in your own worth
Synonyms: self-confident
Examples:

"hardly more than a boy but firm-knit and self-confident"

Related terms: confident
Similar spelling:   self-assurance
  self-sowed
  self-coloured
  self-assertive
  self-seeded
  self-styled
  self-service
  self-colored
  self-centred
  self-assertion
  self-asserting
  self-serving
  self-centered