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[flaming-tyger.livejournal.com]

asperity-noun
1. harshness or sharpness of tone, temper, or manner; severity; acrimony: The cause of her anger did not warrant such asperity.
2. hardship; difficulty; rigor: the asperities of polar weather.
3. roughness of surface; unevenness.
4. something rough or harsh.

http://dictionary.reference.com/browse/asperity