self-restrained

from The Collaborative International Dictionary of English v.0.48

Self-restrained \Self`-re*strained"\, a.
   Restrained by one's self or itself; restrained by one's own
   power or will.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

27 Moby Thesaurus words for "self-restrained":
      assured, balanced, collected, composed, confident, controlled,
      equanimous, equilibrious, firm-minded, forward, importunate,
      independent, levelheaded, poised, pushy, recollected,
      self-asserting, self-assertive, self-assured, self-confident,
      self-controlled, self-expressive, self-possessed, strong-minded,
      strong-willed, together, well-balanced