疲劳
pí láo · HSK 7
weariness
😩 疲 weary + 劳 labour = worn out from toil; láo is the 劳 in 劳动 labour
Both characters carry the sick/illness radical 疒 on top, the same one in 病 illness, marking a body worn down. 劳 láo means labour or toil, so 疲劳 is the fatigue that hard work leaves behind.