| abstruse definitions |
| # | Definition | Sets |
| 1 | difficult to understand | 344 sets |
| 2 | hard to understand | 235 sets |
| 3 | obscure; profound; difficult to understand | 99 sets |
| 4 | adj. difficult to understand | 75 sets |
| 5 | difficult to comprehend | 60 sets |
| 6 | difficult to understand, recondite, concealed | 54 sets |
| 7 | extremely difficult to understand | 49 sets |
| 8 | hard to comprehend | 47 sets |
| 9 | difficult to understand; obscure | 37 sets |
| 10 | difficult to comprehend obscure | 24 sets |
| 11 | dealing with matters difficult to be understood. | 23 sets |
| 12 | difficult to penetrate | 23 sets |
| 13 | adj. dealing with matters difficult to be understood. | 20 sets |
| 14 | adj. obscure; profound; difficult to understand | 18 sets |
| 15 | profound; difficult to understand | 18 sets |
| 16 | difficult to understand, obscure | 18 sets |
| 17 | obscure, profound, difficult to understand | 16 sets |
| 18 | dealing with matters difficult to be understood | 14 sets |
| 19 | profound, obscure, esoteric, occult | 14 sets |
| 20 | (adj.) extremely difficult to understand | 13 sets |
| 21 | complex and difficult to comprehend | 13 sets |
| 22 | hard to understand; recondite; esoteric | 13 sets |
| 23 | obscure | 13 sets |
| 24 | hard to understand, hidden | 12 sets |
| 25 | recondite | 11 sets |
| 26 | difficult to understand; complex | 11 sets |
| 27 | hard to understand; hidden | 10 sets |
| 28 | hard to understand; difficult | 9 sets |
| 29 | difficult to understand; recondite | 9 sets |
| 30 | (adj) difficult to understand | 9 sets |
| 31 | difficult to understand, complex | 9 sets |
| 32 | difficult to comprehend; obscure | 9 sets |
| 33 | difficult to comprehend. | 7 sets |
| 34 | profound, difficult to understand | 7 sets |
| 35 | adj. hard to understand | 7 sets |
| 36 | adj. obscure, profound, difficult to understand | 5 sets |
| 37 | (adj.) hard to understand | 5 sets |
| 38 | difficult to understand, concealed | 5 sets |
| 39 | (adj) - difficult to understand; -hard to understand | 5 sets |
| 40 | simple, straightforward | 5 sets |