| abrupt(adjective, passionate, violent, fast, rapid) |
| sudden(noun, adjective, passionate, violent, fast) |
| acute(adjective, characteristic, feeling, understanding, keen) |
| brief(adjective, time, violent, fast, short) |
| hurried(adjective, time, express, prompt, energetic) |
| ready(adjective, light, free, smooth, easy) |
| bright(adjective, cool, sharp, ability, smart) |
| energetic(adjective, pleasant, keen, sharp, intense) |
| spry(adjective, pleasant, keen, sharp, ability) |
| astute(adjective, understanding, cool, keen, sharp) |
| animated(adjective, keen, bright, intense, energetic) |
| discerning(adjective, characteristic, understanding, cool, keen) |
| impetuous(noun, adjective, passionate, violent, fast) |
| instantaneous(adjective, prompt, fast, summary, speedy) |
| short(adjective, time, fast, casual, early) |
| apt(adjective, smooth, sharp, smart, bright) |
| cursory(adjective, time, light, fast, casual) |
| snappy(adjective, express, prompt, energetic, lively) |
| deft(adjective, light, smooth, sharp, smart) |
| perceptive(adjective, understanding, cool, keen, sharp) |