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Webster 1913 Edition

adv.

In a flippant manner.

adv.

Fluently; with ease and volubility of speech.

flippantly ‎(comparative more flippantly, superlative most flippantly)

In a flippant manner.
- 1918, W. B. Maxwell, chapter 17, in The Mirror and the Lamp:
  “Perhaps it is because I have been excommunicated. It's absurd, but I feel like the Jackdaw of Rheims.” ¶ She winced and bowed her head. Each time that he spoke flippantly of the Church he caused her pain.