| makeshift(adjective, free, informal, casual, snap) |
| near(adjective, present, nearby, there, here) |
| off-the-cuff(adjective, spontaneous, unprepared, impromptu, unrehearsed) |
| off the cuff(adjective, free, informal, casual, snap) |
| off the top of head(expression, idiom, free, informal, casual) |
| offhand(adjective, free, informal, casual, impulsive) |
| on board(expression, adjective, adverb, present, attendant) |
| on deck(expression, adjective, adverb, present, attendant) |
| on hand(expression, adjective, adverb, present, attendant) |
| on the spot(expression, adjective, idiom, adverb, present) |
| on this spot(expression, idiom, adverb, present, attendant) |
| present(adjective, adverb, prompt, fast, quick) |
| prompt |
| quick(adjective, prompt, fast, irritable, immediate) |
| ready(adjective, present, nearby, there, here) |
| show up(expression, adjective, present, near, nearby) |
| snap(adjective, free, informal, casual, impulsive) |
| snappy(adjective, fast, irritable, tetchy, snippy) |
| spontaneous(adjective, free, informal, casual, snap) |
| spur-of-the-moment(adjective, free, informal, casual, snap) |