Disrespectful or overly casual behavior or speech, especially when seriousness or respect is called for.
From the adjective 'flippant' (possibly from the verb 'flip,' meaning to move lightly or speak carelessly) plus the suffix '-cy.' The sense evolved to mean glib or irreverent behavior.
A truly fascinating word for character: flippancy is the armor of people who use humor to avoid genuine emotional engagement—it's the opposite of sincerity, which is why teachers and parents despise it.
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