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| Subject | Russian | English |
| inf. | быть без понятия | have not the foggiest (сокр. от have not the foggiest idea: Honestly, I've got not the foggiest what day of the week it is, let alone week of the month. 4uzhoj) |
| gen. | быть без понятия | have no clue (about something Andrey Truhachev) |
| Игорь Миг | быть без понятия о | be clueless as to |
| rhetor. | быть без понятия, что | have no clue that (Alex_Odeychuk) |