Offhand (adjective)

1. Done without preparation or prior thought; impromptu.
2. Done or said without preparation; extemporaneous.

Origin:

The word "offhand" comes from the phrase "off hand" which means "not prepared or rehearsed".

Examples:

1. He made an offhand remark about the weather.
2. The offhand comment was not well received.
3. The offhand manner in which he delivered the news was inappropriate.
4. The offhand way he handled the situation was not professional.
5. He made an offhand gesture to indicate he was joking.