prattlement means prattle; childish chatter. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From prattle + -ment.
noun
- prattle; childish chatter“April 1805, Francis Jeffrey, "The Lay of the Last Minstrel", in Edinburgh Review
she had never listened to the prattlement of the river and mountain spirits”