The quality or state of being flippant; habitual glib or disrespectful behavior.
From 'flippant' plus the suffix '-ness,' which forms nouns indicating a state or quality. This is a doublet with 'flippancy,' offering an alternative abstract noun form.
English gives us two ways to describe this flaw—'flippancy' and 'flippantness'—but the '-ness' version sounds harsher and more permanent, showing how even word-building choices carry emotional weight.
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