1 to complain

2 to grumble (about)

3 to reproach

4 to blame

1 to complain

2 to grumble

3 to harbor a complaint

4 to feel dissatisfied

1 to work hard without complaint (idiom)

1 grief

2 resentment

3 aggrieved

4 plaintive

1 to pay back a score

2 to get revenge

3 to requite

4 (old) variant of 抱怨[bào yuàn]

1 to return good for evil (idiom)

2 to requite evil with good

1 to repay kindness with kindness, and repay enmity with justice (idiom, from Analects)

1 to work hard without complaint (idiom)

1 (idiom) to blame the gods and accuse others

1 lit. cries of complaint fill the roads (idiom); complaints rise all around

2 discontent is openly voiced