Unsolicited (adjective)

Not requested or invited; given or done without being asked for.

Origin:

The word "unsolicited" comes from the combination of the prefix "un-" meaning not, and the word "solicited" which means requested or invited. together it means not requested or invited.

Examples:

1. He received an unsolicited job offer and had to make a difficult decision.
2. She got an unsolicited gift from her friend.
3. He received an unsolicited phone call from a telemarketer.
4. The company received an unsolicited proposal from a startup.
5. She gave an unsolicited opinion on how to improve the project.