| strange(unusual, silly, foolish, unwise, weird) |
| subtle(adjective, quiet, slight, fine, thin) |
| supernatural(adjective, intellectual, spiritual, psychic, clairvoyant) |
| theoretical(adjective, intellectual, abstract, unreal, unattainable) |
| thought(reasoning, intellectual) |
| unsettled(silly, foolish, stupid) |
| unworldly(adjective, intellectual, supernatural, spiritual, psychic) |
| utopian(adjective, intellectual, abstract, unreal, unattainable) |
| wacky(adjective, simple, silly, foolish, mad) |
| abnormal |
| abstract(adjective, rational, intellectual, unreal, cerebral) |
| bats in the belfry(expression, idiom, silly, foolish, mad) |
| berserk(adjective, silly, foolish, crazy, mad) |
| brainy(adjective, mind, rational, intelligent, thoughtful) |
| clairvoyant(adjective, mind, rational, intellectual, supernatural) |
| cognition |
| crack-brained |
| crackpot |
| daffy |
| deep(adjective, slight, fine, mind, thin) |