tattling
tat-tling
noun
The act of childishly telling tales or informing on someone to an authority figure.
"Her constant tattling annoyed everyone."
Thesaurus
Synonyms: telling, tattle, singing, gabble, prate, gibber, maunder, clack, tittle-tattle, palaver, blabber, twaddle
Antonyms: keep one's mouth shut, keep quiet, shut one's mouth