| ad-lib(adjective, adverb, informal, impulsive, unplanned) |
| ad lib(expression, adjective, adverb, impulsive, impromptu) |
| ad libitum(expression, adjective, adverb, improv, extemporize) |
| as one thinks best(expression, adjective, idiom, adverb, impulsive) |
| as one wishes(expression, adjective, idiom, adverb, impulsive) |
| at will(expression, informal, impulsive, improv, extemporize) |
| extemporaneous(adjective, adverb, informal, impulsive, unplanned) |
| extempore(informal, unplanned, extemporize, off-the-cuff, extemporise) |
| extemporized(informal, unplanned, extemporize, off-the-cuff, extemporise) |
| freely(adverb, impulsive, extemporaneous) |
| impromptu(adjective, adverb, informal, unplanned, spontaneously) |
| improvise(informal, unplanned, extemporize, ad-lib, off-the-cuff) |
| improvised(adjective, adverb, informal, impulsive, extemporaneous) |
| made-up(adjective, adverb, informal, impulsive, extemporaneous) |
| off-the-cuff(adjective, adverb, informal, impulsive, extemporaneous) |
| offhand(adverb, impulsive, extemporaneous, improv) |
| spontaneous(informal, unplanned, extemporize, off-the-cuff, extemporise) |
| spontaneously(adverb, improv, extemporaneously) |
| unprepared(informal, unplanned, extemporize, off-the-cuff, extemporise) |
| unrehearsed(adjective, adverb, informal, impulsive, extemporaneous) |