| ad lib(expression, adjective, adverb, impulsive, unprepared) |
| extemporaneous(adjective, adverb, informal, unplanned, extemporize) |
| impromptu(adjective, adverb, informal, unplanned, spontaneously) |
| improvised(adjective, adverb, informal, unplanned, improv) |
| offhand(adjective, adverb, improv) |
| spontaneously(adjective, adverb, improv, extemporaneously) |
| ad-lib(adjective, adverb, informal, unplanned, spontaneously) |
| makeshift(informal, unplanned, off-the-cuff) |
| according to pleasure(expression, adjective, idiom, adverb, informal) |
| as one thinks best(expression, adjective, idiom, adverb, informal) |
| as one wishes(expression, adjective, idiom, adverb, informal) |
| at will(expression, adjective, adverb, informal, unplanned) |
| freely(adjective, adverb) |
| impulsive(adjective, adverb) |
| jury-rigged |
| made-up(adjective, adverb, informal, unplanned, extemporize) |
| off-the-cuff(adjective, adverb, informal, unplanned, extemporize) |
| spontaneous(informal, unplanned, extemporize, off-the-cuff, extemporise) |
| stopgap |
| unforced |