Endurance, Perseverance
noun, verbal noun
I'm resistant and I endure. I have much endurance and perseverance.
にんたい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
俺は社長の腰巾着かもしれないが、それって俺にはすごい忍耐力があるってことにもならないかな？
I may be following our president around like a shadow, but doesn’t that mean I have great endurance?