WordЭто тонкая книга.MeaningThis is a thin book.Part of speechsentencePronunciationCourseRussianLessonGenitive plural of adjectives (-ых, -их)Breakdown of Это тонкая книга.этоthis / it isкнигаbookтонкийthin (of an object)Elon.io is an online learning platformWe have an entire course teaching Russian grammar and vocabulary.Start learning Russian now