| goalless(adjective, insignificant, irregular, senseless, erratic) |
| good-for-nothing(adjective, insignificant, irregular, empty, senseless) |
| heedless(adjective, careless, useless, erratic, frivolous) |
| heterogeneous(adjective, extensive, chaotic, random, haphazard) |
| ill-considered(adjective, impulsive, unqualified, unsuspecting, unready) |
| immediate(noun, free, informal, casual, impulsive) |
| imperceptive(adjective, extensive, chaotic, random, haphazard) |
| improv(free, informal, casual, impulsive, unprepared) |
| improvisatory(free, informal, casual, impulsive, unprepared) |
| improviso(free, informal, casual, impulsive, unprepared) |
| incautious |
| indistinguishable |
| inevitable(adjective, simple, natural, casual, impulsive) |
| insignificant(adjective, irregular, empty, senseless, unwarranted) |
| irregular(adjective, insignificant, chance, casual, senseless) |
| irresistible(adjective, simple, natural, casual, impulsive) |
| jamming(free, informal, casual, impulsive, unprepared) |
| jumbled(adjective, extensive, chaotic, messy, random) |
| madcap |
| made-up(free, informal, casual, impulsive, unprepared) |