朽 jau² {xiǔ}

rotten

朽敗〔-败〕 nau² baai⁶ {xiǔ bài}

decayed; rotten

朽邁〔-迈〕 nau² maai⁶ {xiǔ mài}

ageing

朽蠹 nau² dou³ {xiǔ dù}

1. to decay and be eaten by worms etc
2. to over-hoard grain so that it rots

朽爛〔-烂〕 nau² laan⁶ {xiǔ làn}

rotten

朽木 nau² muk⁶ {xiǔ mù}

rotten wood

朽壞〔-坏〕 nau² waai⁶ {xiǔ huài}

rotten

朽木糞土〔--粪-〕 nau² muk⁶ fan³ tou² {xiǔ mù fèn tǔ}

rotten wood and manure, to describe someone who is worthless with no contribution to the society