kan-khóo艱苦

arduous

arduous; laborious; poor; impoverished; to fall ill; to be ill

English Wiktionary, “艱苦” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E8%89%B1%E8%8B%A6 · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)