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Flippant
Inappropriate Situations
Use 'flippant' when someone's behavior is inappropriately casual or uncaring in serious situations. 
Tone of Voice
The tone of a flippant person often sounds dismissive or insensitive, lacking empathy. 
Misinterpretation Risk
Be careful using 'flippant' as it might be misunderstood as humorous or witty when not intended. 