| natural(adjective, simple, casual, impulsive, willing) |
| nominal(adjective, feature, characteristic) |
| purposed(verb, adjective, deliberate, careful, thoughtful) |
| self-imposed |
| unrecompensed(adjective, work, pay, unpaid, unrewarded) |
| unremunerated(adjective, work, pay, unpaid, unrewarded) |
| voluntarily(adjective, adverb, willing, arrogant, unsolicited) |
| alternative(open, free, elective) |
| amateur(adjective, honorary) |
| arbitrary(open, free, elective) |
| automatic(adjective, simple, natural, casual, impulsive) |
| contemplated(deliberate, determined, intentional, treated, thought-out) |
| express(adjective, exact, certain, deliberate, careful) |
| extemporaneous(adjective, simple, natural, casual, impulsive) |
| free will(expression, idiom) |
| impulsive(adjective, simple, natural, casual, willing) |
| leap |
| meant(deliberate, planned, intended) |
| meditated(deliberate, planned, intended) |
| nonobligatory(open, free, elective) |