hùi-lia̍k費力

to need or exert great effort

to need or exert great effort; to strain; to be strenuous

English Wiktionary, “費力” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E8%B2%BB%E5%8A%9B · confidence: Medium (Wiktionary, Hokkien)