Question

What does 'sleety whistle suggest?​

Answer 1

Answer:

The subsequent three lines all rhyme with each other: 'The north cannot undo them, With a sleety whistle through them, ... Keats has represented the idea that nature is impenetrable, like the 'north cannot undo' nature, and the 'sleety whistle' cannot get 'through' nature, and 'frozen thawing' is disabled