Self-imposed and Unprompted

Self-imposed adjective - Done, made, or given with one's own free will.

Unprompted and self-imposed are semantically related. in voluntary topic. In some cases you can use "Unprompted" instead an adjective phrase "Self-imposed".

Unprompted adjective - Proceeding from natural feeling or impulse without external stimulus.

Self-imposed and unprompted are semantically related. Sometimes you can replace phrase "Self-imposed" with "Unprompted", this terms are similar.