Flippant (adjective)

1. Treating serious issues with a lack of respect or sensitivity; not showing a proper seriousness.
2. Frivolously casual or disrespectful in nature or manner.

Origin:

Late 18th century: from french, "flippant", present participle of flipper "to flirt", from a germanic source akin to middle low german vlippen "to skip about".

Examples:

1. The politician's flippant comments about the crisis showed a lack of concern for its seriousness.
2. His flippant attitude toward the situation was perceived as insensitive.
3. She was criticized for making flippant remarks about the tragedy.
4. The comedian's flippant jokes were not well received by the audience.
5. His flippant response to the question was deemed inappropriate.