ˌmɛtəˈnɔɪə | met-uh-NOY-uh
Metanoia, as a rhetoric device, is following up a statement with another of similar sentiment but contrasting severity. When strengthening the original idea, it can be used as a clarifier or an escalating gradient; when softening it, it can create a mild recanting or a dramatic understatement.
Examples:
- I fear that the slog is going to hinder me – that it’s going to smoother my brain, dull my senses, and rip the joy out of everything I do.
- The slog is the absolute worst. It’s just…really not my favorite thing, you know?
Metanoia. Use it.
Bene scribete.
Writin' Fish 
I see you share a love of words.
There is a Porcupine Tree album called Metanoia… but I was not aware of the meaning of the word until now.
Words are fantastic, aren’t they? (And speaking of “Porcupine Tree”, band names always seem to be a place to have fun with them. (>^-‘)> )
Metanoia (outside of rhetoric) can also refer to a spiritual transformation, though, which may have been more along the lines of what they were going for. Its literal meaning, from Greek, is a “change (of one’s) mind”, etymologically comparable to paranoia – “beside (one’s) mind”.