We like to use the term passive candidate. We don’t want to hire someone who is looking for a job, we want passive candidates.
But it’s not an either or thing. A truly passive candidate isn’t taking your call. They aren’t open to a change. At some point, things may change for that candidate and they become open to at least talking, possibly considering a change.
What you want is a partially passive candidate or a mostly passive candidate.
Someone who is good and doesn’t need to make a change but who has come to realize that considering your opportunity may be best.