まして (況して)

Otona no watashi de sae kono omoi nimotsu o motenai no dakara, mashite kodomo ni wa muri da.

Even I, an adult, cannot carry this heavy luggage, much less a child.

Senmonka de sae kaiketsu dekinai nanmon na no dakara, mashite shirōto no watashi ni wakaru hazu ga nai.

Since it is a difficult problem that even experts cannot solve, let alone a novice like me.

Nichijō no seikatsuhi o harau no mo seiippai na noni, mashite kaigai ryokō ni iku yoyū nado nai.

I am barely managing to pay for daily living expenses, let alone having the luxury to travel abroad.

Kare wa nihongo no nichijō kaiwa mo obotsukanai noni, mashite bijinesu kōshō nado dekiru wake ga nai.

He is struggling even with daily Japanese conversation, let alone being able to conduct business negotiations.

Jibun no kuni no kotoba de mo hyōgen ga muzukashii no dakara, mashite gaikokugo de tsutaeru no wa shinan no waza da.

Since it is difficult to express even in one's native language, not to mention trying to convey it in a foreign language, which is a monumental task.

Hiruma de sae hinan keiro o miushinaisō na ōyuki na noni, mashite yakan to nareba ippo mo ugokenai darō.

With heavy snow making it easy to lose sight of the evacuation route even during the day, much less at night, we probably wouldn't be able to move a single step.