| delusional | (adjective) suffering from or characterized by delusions | - |
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| delusive | (adjective) inappropriate to reality or facts | Synonyms: false |
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| delusory | (adjective) causing one to believe what is not true or fail to believe what is true | Synonyms: deceptive |
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| elusive | (adjective) skillful at eluding capture | - |
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| (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, knotty, problematic, problematical, tough |
| (adjective) difficult to detect or grasp by the mind or analyze | Synonyms: subtle |
| (adjective) difficult to describe | - |