не по плечу

см. тж. по плечу

(кому)

he (she) is not equal (not up) to this work; it is beyond his (her) strength; it is out of his (her) depth

Он был хорошим командиром танковой бригады, мог бы быть неплохим командиром корпуса. Но танковая армия ему была не по плечу. (К. Рокоссовский, Солдатский долг) — He was an excellent brigade commander and would have been a good corps commander, but a tank army was out of his depth.

Он уже дважды просил отпустить его и дважды получал отказ. Не верили ссылкам на плохое здоровье, не понимали, что ноша становится ему не по плечу, по инерции считали прекрасным директором, вполне соответствующим своему посту. (В. Попов, Обретёшь в бою) — Twice he had sent in his resignation and twice it had been refused. Those above him did not believe his complaint that his health was failing, they did not understand that the burden was now beyond his strength to carry; they went on believing by inertia that he was an excellent director, fully capable of handling the job.