| hand at(expression, smart, skilled, clever, able) |
| handy(adjective, good, smooth, keen, sharp) |
| heady(adjective, smooth, keen, sharp, smart) |
| hot(expert, skilled, capable, skillful, adroit) |
| hotshot(expert, skilled, capable, skillful, adroit) |
| hyperintelligent |
| imaginative(smart, bright, heavy, rational, intellectual) |
| in the know(expression, adjective, idiom, smooth, keen) |
| incisive(understanding, keen, smart, alert, sensitive) |
| inside(sharp, smart, intelligent, clever, astute) |
| instructed(smart, bright, familiar, informed, experienced) |
| intellective(rational, intelligent, thoughtful, serious, wise) |
| intended(adjective, cool, crack, significant, intelligent) |
| intent(adjective, reasonable, keen, deep, rational) |
| intentional(adjective, cool, crack, significant, intelligent) |
| into(adjective, smooth, smart, knowledgeable, practical) |
| intuitive(adjective, understanding, keen, sharp, smart) |
| inventive(smart, bright, rational, intelligent, brilliant) |
| keen-witted |
| know stuff(expression, expert, skilled, capable, skillful) |