There is a report on Terminated Volunteers, but the Inactive Volunteers reports are about non-terminated volunteers during a particular period of time. You don't need a filter to run those.
Reports | Volunteer Reports | Inactive Volunteers | [Totally Inactive by Volunteer | Partially Inactive by Volunteer | Without Placements].
Non-terminated volunteers who have not served hours at any of their placements during a period of time. Includes their placements and phone numbers.
Non-terminated volunteers who have served hours at other placements during the period, but not these. Includes their phone numbers and placements that don't have hours.
Non-terminated volunteers without any placements. Includes their starting date and phone numbers.