Synonyms of 'blabber'
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If someone is blathering on about something, they are talking for a long time about something that you consider boring or unimportant.
He kept on blathering about police incompetence.
If you refer to someone as a busybody, you are criticizing the way they interfere in other people's affairs.
Some busybody tipped off the police.
If you chatter, you talk quickly and continuously, usually about things which are not important.
Everyone was chattering away in different languages.
Thesaurus for blabber from the Collins English Thesaurus
a person who blabs