What does unneccessary mean?

"Unnecessary" means not needed or required. It suggests something is superfluous, redundant, or expendable. Here are some synonyms:

* Unrequired

* Superfluous

* Extraneous

* Redundant

* Needless

* Unimportant

* Excessive

Example:

"It was an unnecessary risk to take, and it could have cost them everything."

In this sentence, "unnecessary" means the risk was not needed and was avoidable.