babbler

What it means

1. Someone who babbles.

   Great babblers, or talkers, are[…] not fit […]for trust.

   1692, Roger L’Estrange, “ (please specify the fable number.) (please specify the name of the fable.)”, in Fables, of Æsop and Other Eminent Mythologists: […], London: […] R[ichard] Sare, […], →OCLC

2. Any of several passerine birds, of the families Leiothrichidae, Timaliidae and Paradoxornithidae (found in Asia and Africa), and Pomatostomidae (found in Australia).
3. datedA hound who is too noisy on finding a good scent.

In a sentence

Great babblers, or talkers, are[…] not fit […]for trust.

1692, Roger L’Estrange, “ (please specify the fable number.) (please specify the name of the fable.)”, in Fables, of Æsop and Other Eminent Mythologists: […], London: […] R[ichard] Sare, […], →OCLC

Where it comes from

1. Middle Englishbabeler
2. Englishbabbler

From Middle English babeler, babler, equivalent to babble + -er.