The Dictionary explains the traditional normative spellings of Russian orthograms, which are not subject to any rules. Such orphograms make it difficult for writers to understand the reasons for writing that seem random and illogical. The dictionary exempts from the need to memorize and mechanically memorize difficult cases of Russian spelling, instilling a conscious attitude to the written Russian word, a desire to understand the logic of its writing and thereby helping to form stable spelling skills. The reader gets acquainted with the relevant historical processes in the Russian language, which determined the appearance of unverifiable orthograms. The dictionary explains more than 6,000 unverifiable orphograms of the Russian language . For anyone involved in teaching Russian orthography and its use.