| sagacious(adjective, sharp, smart, sensible, intelligent) |
| arcane(adjective, obscure, complex, deep, mysterious) |
| astute(adjective, sharp, smart, bright, sensible) |
| discerning(adjective, sharp, smart, bright, intelligent) |
| intelligent(adjective, keen, sharp, smart, bright) |
| intimate(adjective, secret, private, personal, innermost) |
| knowing(adjective, sharp, smart, bright, intelligent) |
| sound(noun, adjective, reasonable, sensible, wise) |
| strong(adjective, strong, hard, great, sharp) |
| utter(adjective, great, intense, full, emotional) |
| absolute(adjective, great, intense, full, emotional) |
| enigmatic(adjective, hard, obscure, deep, tricky) |
| fathomless(adjective, deep, bottomless) |
| fundamental(adjective, abstract, theoretical, abstruse, philosophical) |
| incomprehensible |
| learned(adjective, deep, thoughtful, moral, intellectual) |
| occult(adjective, obscure, complex, deep, thoughtful) |
| punishing |
| scholarly(adjective, obscure, smart, bright, complex) |
| sharp(adjective, strong, keen, smart, bright) |