The Greek adjective for intrinsic goodness — something that is genuinely excellent, beautiful in character, or noble in quality. Unlike agathos (G18, good in a moral/beneficent sense), kalos carries more aesthetic and evaluative force: it is the good that is also lovely, the excellence that commends itself to perception.
The LXX uses kalos for God's verdict on creation — 'very good' (Gen 1:31). In the NT, 'good works' (kala erga) are deeds done publicly so that observers glorify God (Matt 5:16) — works that are both morally right and visibly attractive. Jesus as the 'Good Shepherd' (John 10:11) is literally the kalos shepherd — the noble, beautiful one who lays down his life. Paul's charge to 'fight the good (kalos) fight' is the noble contest of faith.