| unforced(adjective, free, simple, deliberate, natural) |
| spontaneous(adjective, free, deliberate, natural, impulsive) |
| free(adjective, simple, deliberate, natural, casual) |
| voluntary(adjective, free, simple, deliberate, natural) |
| willful(adjective, free, deliberate, natural, willing) |
| autonomous(adjective, free, deliberate, natural, willing) |
| gratuitous(adjective, free, deliberate, natural, willing) |
| independent(adjective, free, deliberate, natural, willing) |
| optional(adjective, free, deliberate, natural, willing) |
| unbidden(adjective, free, simple, deliberate, natural) |
| unconstrained(adjective, free, simple, deliberate, natural) |
| volunteer(adjective, free, deliberate, natural, willing) |
| deliberate(adjective, free, natural, willing, charitable) |
| discretional(adjective, free, deliberate, natural, witting) |
| out of control(expression, idiom) |
| unasked(adjective, free, deliberate, natural, willing) |
| volitional(adjective, free, deliberate, natural, willing) |
| arbitrary(voluntary, elective) |
| chosen(adjective, free, deliberate, natural, willing) |
| discretionary(voluntary, elective) |