| purblind(adjective, myopic) |
| quick-witted(sharp, smart, intelligent, clever, astute) |
| rapt(adjective, reasonable, keen, deep, rational) |
| rational(adjective, calm, sound, reasonable, keen) |
| ready |
| reasonable(adjective, calm, sound, keen, sensible) |
| reasoning(adjective, reasonable, keen, deep, rational) |
| reflecting(adjective, reasonable, keen, deep, rational) |
| reflective(adjective, reasonable, keen, deep, rational) |
| retrospective(adjective, reasonable, keen, deep, rational) |
| savvy(adjective, smooth, keen, sharp, smart) |
| serious(adjective, reasonable, keen, deep, rational) |
| shark(sharp, smart, intelligent, clever, astute) |
| sharp(adjective, smooth, keen, smart, intelligent) |
| sharp-eyed |
| sharp-sighted |
| slick(adjective, smooth, keen, sharp, smart) |
| slippery(sharp, smart, intelligent, clever, astute) |
| sly(adjective, smooth, keen, sharp, smart) |
| smart(adjective, smooth, keen, sharp, intelligent) |