exhausting; hard; tough; arduous; to work hard; to go to a lot of trou
辛 (Xīn) · 7 strokes
Pictograph of a chisel-like tool. The meaning later shifted to "hard" and "laborious".
苦 (kǔ) · 8 strokes
Phonosemantic compound. 艹 represents the meaning and 古 represents the sound.