You have an obligation to look after your younger siblings.
I’d love to come to your birthday party but, unfortunately, I have a previous obligation.
Her emotions have been dormant since she was a child.
The volcano is dormant but not extinct; it could erupt in the future.
I think I’m coming down with a cold—I’ve been rather sluggish all day and my nose is stuffed.
I’m not sure what’s wrong with my car except that it’s sluggish.