From Sanskrit सर्वश्रेष्ठ (sarvaśreṣṭha), composed of सर्व (sarva, “all, every; altogether”) + श्रेष्ठ (śreṣṭha, “best, finest”).
सर्वश्रेष्ठ • (sarvaśreṣṭh) (indeclinable)