| incomprehensible(adjective, abnormal, aberrant, anomalous, aberrated) |
| inconceivable(adjective, abnormal, aberrant, anomalous, aberrated) |
| incredible(adjective, abnormal, aberrant, anomalous, aberrated) |
| infamous(adjective, bright, distinguished, illustrious, astral) |
| informed(adjective, bright, alert, brilliant, brainy) |
| ingenious(adjective, bright, alert, brilliant, brainy) |
| insightful(adjective, bright, alert, brilliant, brainy) |
| inventive(adjective, bright, alert, brilliant, brainy) |
| jim-dandy(adjective, beautiful, awesome, banner, bang-up) |
| judicious(adjective, bright, alert, brilliant, brainy) |
| keen(adjective, bright, alert, beautiful, brilliant) |
| knowing(adjective, bright, alert, brilliant, brainy) |
| knowledgeable(adjective, bright, alert, brilliant, brainy) |
| learned(adjective, bright, alert, brilliant, brainy) |
| literate(adjective, bright, alert, brilliant, brainy) |
| lofty(adjective, haughty, disdainful, cavalier, highfalutin) |
| logical(adjective, bright, alert, brilliant, brainy) |
| lordly(adjective, lofty, haughty, disdainful, cavalier) |
| lovely(adjective, beautiful, awesome, banner, bang-up) |
| luminous(adjective, bright, distinguished, illustrious, astral) |