persevere
https://gyazo.com/491e752bb3780ab6e7fb11a55d44a154
verb no object
continue in a course of action even in the face of difficulty or with little or no prospect of success:
｟ほめて｠ (困難なことでもあきらめずに) «…を［に］» がんばってやり通す, 屈しない; 我慢する, 耐える «in, with, at» ; 【人を】信じ続ける «with» (→ persist)
e.g. his family persevered with his treatment.
ORIGIN
late Middle English: from Old French perseverer, from Latin perseverare ‘abide by strictly’, from perseverus ‘very strict’, from per- ‘thoroughly’ + severus ‘severe’.