| difficult(adjective, characteristic, mystery, abstraction) |
| egghead(adjective, characteristic, cleverness, smartness) |
| esoteric(adjective, characteristic, mystery, abstraction) |
| expert(adjective, characteristic, cleverness, smartness) |
| foxy(adjective, characteristic, cleverness, smartness) |
| gifted(adjective, characteristic, cleverness, smartness) |
| gnostic(adjective, characteristic, wisdom, acuteness) |
| handy(adjective, characteristic, cleverness, smartness) |
| heavy(adjective, characteristic, mystery, abstraction) |
| hermetic(adjective, characteristic, mystery, abstraction) |
| hidden(adjective, characteristic, mystery, abstraction) |
| incisive(adjective, characteristic, mystery, abstraction) |
| insighted(adjective, characteristic, wisdom, acuteness) |
| insightful(adjective, characteristic, wisdom, acuteness) |
| intricate(adjective, characteristic, mystery, abstraction) |
| inventive(adjective, characteristic, cleverness, smartness) |
| judicious(adjective, characteristic, wisdom, acuteness) |
| keen(adjective, characteristic, cleverness, smartness) |
| learned(adjective, characteristic, mystery, abstraction) |
| many-sided(adjective, characteristic, cleverness, smartness) |