| unpremediated(adjective, simple, natural, casual, impulsive) |
| unprompted(adjective, simple, natural, casual, impulsive) |
| unsophisticated(adjective, simple, natural, casual, impulsive) |
| unstudied(adjective, simple, natural, casual, impulsive) |
| up front(expression, adjective, simple, natural, casual) |
| voluntary(adjective, simple, natural, casual, impulsive) |
| willing(adjective, simple, natural, casual, impulsive) |
| abrupt(adjective, violent, fast, quick) |
| according to pleasure(expression, idiom, spontaneously, improv, extemporaneously) |
| ad hoc(expression, adjective, informal, snap, unrehearsed) |
| ad libitum(expression, spontaneously, improv, extemporaneously) |
| artless(impulsive, unprompted, spur-of-the-moment) |
| as one thinks best(expression, idiom, spontaneously, improv, extemporaneously) |
| as one wishes(expression, idiom, spontaneously, improv, extemporaneously) |
| at first glance(expression, adjective, idiom, informal, snap) |
| at will(expression, spontaneously, improv, extemporaneously) |
| automatically(spontaneously, improv, extemporaneously) |
| brash(adjective, foolish, thoughtless, unwise) |
| breakneck(adjective, violent, fast, quick) |
| brief(adjective, violent, fast, quick) |