Here are some synonyms for unusual:
* Uncommon
* Rare
* Strange
* Odd
* Peculiar
* Unorthodox
* Out of the ordinary
* Exceptional
* Unique
Examples:
* "The weather today is unusually warm for this time of year."
* "He has an unusual collection of antique toys."
* "She had an unusual way of speaking."
The meaning of "unusual" can vary depending on the context. For example, something unusual in one culture might be commonplace in another.