chunter[verb]Synonyms: mumble, fumble, muddle, mump, murmur, mutter, swallow
[TahlilGaran] English Synonym Dictionary ▲
chun‧ter /ˈtʃʌntə $ -ər/
verb [intransitive] British English informal to talk for a long time, usually about something that is not interesting:
He was chuntering on about the problems he was having with his car. [TahlilGaran] Dictionary of Contemporary English ▲