The Greek adjective ametakinetos means "immovable" or "unable to be moved." It appears in 1 Corinthians 15:58 as Paul's call to believers to be immovable in their resurrection hope and therefore abounding in the Lord's work.
Paul's use of ametakinetos at the climax of his resurrection chapter is strategic. Because the resurrection of Christ guarantees our resurrection, believers are to be immovable — not shaken by persecution, suffering, doubt, or cultural pressure. Your labor in the Lord is not in vain.