Unconditional means not based on prior merit, worthiness, or achievement; describes God's grace, love, and promises as originating in His own character.
The Gospel is unconditional in its offer, but not meaningless in its effect. God does not save because man is worthy; He saves because He is merciful.
See in Scripture: Romans 9:16; Ephesians 2:8–9; Titus 3:5; 2 Timothy 1:9