noun (common) (futsuumeishi) no darse jamás por vencido;tener una voluntad de hierro;tener una voluntad inquebrantable

noun (common) (futsuumeishi) yojijukugo indefatigability;indomitableness;with unremitting tenacity

adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi) unbending;inflexible;tenacity;indomitableness

Futou