| irresistible(adjective, simple, natural, casual, impulsive) |
| jamming(free, casual, impulsive, spontaneous, unprepared) |
| jumping the gun(expression, idiom, thoughtless, impetuous, unwary) |
| jury-rig |
| jury-rigged |
| machinate(verb, plan, create, arrange, design) |
| mad(thoughtless, impetuous, unwary) |
| made-up(adjective, free, informal, casual, impulsive) |
| make(verb, fix, produce, create, design) |
| mastermind(verb, plan, create, arrange, design) |
| natural(adjective, simple, casual, impulsive, willing) |
| off the hip(expression, idiom, offhand, impromptu, extemporaneous) |
| off top of head(expression, adjective, idiom, adverb, simple) |
| on-the-spot(free, fake, casual, impulsive, spontaneous) |
| on impulse(expression, free, fake, casual, impulsive) |
| originate(verb, make, fix, produce, create) |
| plan(verb, produce, create, arrange, design) |
| play it by ear(verb, expression, idiom, craft, plan) |
| played by ear(expression, idiom, fake, unqualified, unrehearsed) |
| prepare(verb, make, fix, plan, create) |