self-sufficient

/S EH1 L F S AH0 F IH0 SH AH0 N T/
adjective
  1. 1

    Able to provide for oneself independently of others; not needing external support.

  2. 2

    Overconfident in one's own abilities; arrogant.

Source: https://en.wiktionary.org/wiki/self-sufficient