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Webster 1913 Edition

Noun.

[L.

protervitas

, from

protervus

violent.]

Peevishness; petulance.

[Obs.]

Fuller.

Noun.

[L.protervitas, from protervus; pro and torvus, crabbed.] Peevishness; petulance. [Little used.]

protervity ‎(plural protervities)

(rare) wantonness; waywardness; petulance; peevishness
- Samson Lennard: Of Wisdom, bk.I,ch.XXXV, 1651:
  A vain and frail protervity, an envious prattling.