| Subject | English | Russian |
| biol. | head scratching | почёсывание головы (элемент комфортного поведения) |
| rhetor. | head-scratching | малопонятный (Sometimes the AI system makes head-scratching decisions.  singularityhub.com Alex_Odeychuk) |
| fig. | head-scratching | загадочный (Weather experts are baffled after over 100 mature trees were knocked down in Washington State. The head-scratching event occurred in the early morning hours at the Olympic National Park. A mysterious rumbling sound was heard by people living nearby. -- загадочное происшествие (coasttocoastam.com) ART Vancouver) |
| gen. | head-scratching moment | момент замешательства (Taras) |