strength of will en · NOUN
Meanings
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(uncountable) The ability to stick to one's prior commitments, strivings, etc.; determination, willpower.
[A]nd he was dissatisfied with himself for not showing more strength of will.
1901 [1878], chapter 16, in Constance Garnett, transl., Anna Karenina, translation of Анна Каренина (Anna Karenina) by Leo Tolstoy, part 5: