Definition of "prattling"

I haue heard of your pratlings too wel enough.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene ii], page 266

The boy, who had been regarding him with the tolerant curiousness one accords to the prattlings of the feeble-minded, answered promptly.

1912, Jack London, chapter 1, in The Scarlet Plague‎, New York: Macmillan, published 1915, page 19