It was Professor McGonagall, and her mouth was the thinnest of thin lines.

I don't quite get what the expression "her mouth was the thinnest of thin lines" conveys. Is it angry, strict or something?

  • 1
    "The thinnest of thin" is like "very, very thin". Whatever emotion causes one to tense the lip muscles into a straight line. You'd have to rely on context to determine the emotion. – Tᴚoɯɐuo Nov 7 '18 at 9:25

Angry. Imagine something like this or this. The lips are closed tightly to form a thin line.

  • But the facial gesture is not necessarily angry (even if McGonagall happens to be). Some form of grimness. Determination would also fit. – Tᴚoɯɐuo Nov 7 '18 at 9:23

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