absorbed in a book

Translations
погружённый в книгу
They were so absorbed in a book that they missed the bus stop.
Они были так погружены в книгу, что пропустили автобусную остановку.
Definitions
Engrossed or deeply focused on reading a book, to the extent that one is unaware of their surroundings or other activities.
Words
book

noun
книга
absorb

verb
впитывать