kvetch 
/ˈkvɛtʃ/ verb
kvetch·es; kvetched; kvetch·ing /ˈkvɛtʃ/ verb chiefly US, informal : to complain often or constantly [no obj] ▪ They're always kvetching about something. [+ obj] ▪ They're always kvetching (to us) that nothing is any good.
— kvetch·er noun, plural kvetch·ers [count]
