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| Subject | Russian | English |
| avia. | в кабине экипажа дым по неизвестной причине | there is a smoke of unknown origin in the cockpit (типовое сообщение по связи) |
| gen. | по неизвестной причине | for whatever reason (Unfortunately, for whatever reason, the victim did not come forward. • The image became synonymous with the notion that the 'spaceman' was an alien visitor that, for whatever reason, was invisible in person but which showed up in the photograph.'  unexplained-mysteries.com ART Vancouver) |
| O&G, sakh. | по неизвестной причине | by unknown cause (Sakhalin Energy) |
| econ. | по неизвестной причине | inexplicably (A.Rezvov) |
| gen. | по неизвестной причине | for some unknown reason (lexicographer) |
| gen. | по неизвестной причине | of unknown cause (Min$draV) |
| comp., MS | Профилирование не удалось выполнить по неизвестной причине | Profiling failed for an unknown reason (Visual Studio 2013 ssn) |
| psychol. | случающийся неожиданно или по неизвестной причине | fortuitous |