endurance; perseverance; patience
A noun referring to the quality of enduring hardship or waiting calmly. Often used in contexts emphasizing mental fortitude or long-term effort.
I really admire his patience.
You need perseverance to keep doing this job.
Compound of 忍耐 (にんたい, endurance) + 心 (しん, heart/mind). The exact historical derivation is uncertain, but the word is formed from established Sino-Japanese morphemes.