(of a person or a person's tongue) inclined to blab or gossip.

(un-, prefix1 affix 1.)

Of the nature of a blab, given to blabbing.

That blabs or publishes secrets.

figurative. Of persons, their tongues: Not reticent, blabbing. Of memory: Not retentive.

blabbing.

blab-mouth, blab-tongue; so blab-mouthed adj.; blab-off n. attributive (see quot. 1953).

Originally U.S. That tells everything; displaying or characterized by complete candour; esp. (of a book, account, etc.) in which (typically…