Of events: Not predetermined; unfixed, uncertain. Obsolete.

Brought about by one's own choice or deliberate action; self-inflicted, self-induced.

That is set by oneself or itself (in various senses of set, v.1); esp. (of a task, goal, limit, etc.) imposed by oneself on oneself.

Of an obligation, task, circumstance, etc.: imposed on oneself of one's own volition, or on one's own initiative.

Not providential.

Induced by oneself; brought about or produced as a result of one's own actions or efforts.

(un-, prefix1 affix 2.)