无尽无休 is an idiom
无尽无休wú jìn wú xiū
没完没了（含有厌恶的意思）。
Word breakdown for “无尽无休”: Open in Reader →
无無top 2kAmong the 2,000 most common words used in 南无[nā mó]
无無HSK 4top 2kAmong the 2,000 most common words 1.not to have2.no3.none4.not+3 more+4 more 休top 5kAmong the 5,000 most common words surname Xiu
休top 5kAmong the 5,000 most common words 1.to rest2.to stop doing sth for a period of time3.to cease4.(imperative) don't+1 more