NOUN (2)

1. (Yiddish) a vulgar shrew; a shallow coarse termagant;

2. (Yiddish) a woman who talks too much; a gossip unable to keep a secret; a woman who spreads rumors and scandal;

WordNet (r) 3.0 (2006):

yenta
    n 1: (Yiddish) a vulgar shrew; a shallow coarse termagant
    2: (Yiddish) a woman who talks too much; a gossip unable to keep
       a secret; a woman who spreads rumors and scandal

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "yenta":
   Paul Pry, Peeping Tom, a tale-bearing animal, backseat driver,
   busybody, eavesdropper, gossip, gossip columnist, gossiper,
   gossipmonger, inquirer, inquisitive, inquisitor, intermeddler,
   kibitzer, meddler, newsmonger, newspaperman, nosy Parker, prier,
   pry, querier, querist, questioner, quidnunc, reporter, rubberneck,
   rubbernecker, rumormonger, scandalmonger, scopophiliac, sightseer,
   snoop, snooper, tabby, talebearer, taleteller, tattler, tattletale,
   telltale, tittle-tattler, voyeur