Self-sufficient /(?)/

Self·-suf·fi·cient

Self-sufficient

a.
  1. Sufficient for one's self without external aid or cooperation.
    Neglect of friends can never be proved rational till we prove the person using it omnipotent and self-sufficient, and such as can never need any mortal assistance.
  2. Having an overweening confidence in one's own abilities or worth; hence, haughty; overbearing.