However (conjunction)

1. In whatever way or manner; in any case.
2. Despite that; nonetheless.

Origin:

Middle english how so ever, from howso "in whatever manner" + ever.

Examples:

1. However, I can't agree with you.
2. I'm not sure. However, I'll try.
3. It's a small company. However, it is doing well.
4. He was tired. However, he agreed to help.
5. It's expensive. However, it's worth it.