| independent(natural, spontaneous, voluntary) |
| optional(natural, spontaneous, voluntary) |
| uncalled-for(adjective, willing, arrogant, voluntary, unwelcome) |
| uncompelled(adjective, simple, natural, casual, impulsive) |
| unforced(adjective, simple, natural, casual, impulsive) |
| unintended(adjective, forced, unwilling, obligatory, compulsory) |
| unintentional(adjective, simple, natural, casual, impulsive) |
| unwanted(adjective, willing, arrogant, voluntary, unwelcome) |
| unwitting(adjective, natural, spontaneous, voluntary, forced) |
| volunteer(natural, spontaneous, voluntary) |
| willful(natural, spontaneous, voluntary) |
| abrupt(adjective, passionate, violent, thoughtless, impetuous) |
| ad-lib(adjective, adverb, simple, violent, natural) |
| arbitrary |
| begrudging(adjective, dissatisfied, forced, unwilling, obligatory) |
| brainish |
| break loose(expression, adjective, simple, natural, casual) |
| careless(adjective, passionate, violent, thoughtless, abrupt) |
| casual(adjective, simple, natural, impulsive, willing) |
| devil-may-care(adjective, passionate, violent, thoughtless, abrupt) |