| spontaneous(adjective, feature, characteristic, simple, regard) |
| voluntary(adjective, feature, characteristic, open, free) |
| free(adjective, feature, characteristic, open, simple) |
| intentional(adjective, feature, characteristic, free, regard) |
| volunteer(adjective, feature, characteristic, free, regard) |
| instinctive(adjective, open, simple, easy, natural) |
| volitional(adjective, feature, characteristic, open, free) |
| optional(adjective, free, deliberate, natural, willing) |
| unasked(adjective, feature, characteristic, free, regard) |
| uncoerced |
| uncompelled(adjective, free, simple, deliberate, natural) |
| unconstrained(adjective, feature, characteristic, free, simple) |
| willful(adjective, free, keen, happy, agreeable) |
| deliberate(adjective, feature, characteristic, free, keen) |
| gratuitous(adjective, feature, characteristic, free, deliberate) |
| intended(adjective, feature, characteristic, free, regard) |
| willing(adjective, free, simple, keen, enthusiastic) |
| autonomous(adjective, feature, characteristic, free, deliberate) |
| discretional(adjective, feature, characteristic, open, free) |
| independent(adjective, feature, characteristic, free, deliberate) |