Peroration

noun

  1. the concluding part of a speech, typically intended to inspire enthusiasm in the audience: he again invoked the theme in an emotional peroration.

[“The Island” — Lord Byron]

Persiflage

noun

  1. Light and slightly contemptuous mockery or banter

[The Art of Memoir – Mary Karr]

Pertinacious

adj.

  1. Holding tenaciously or stubbornly to a purpose, opinion, or course of action.
  2. Extremely persistent or unyielding.

[Moby-Dick; or, The Whale — Herman Melville]