Similar entry in other lexica (references at Photius tau589 Theodoridis) but with the two adjectives not in the masculine nominative singular, as here, but the masculine accusative singular or neuter nominative/accusative singular.
Both of these adjectives derive from the concept of tu/xh (tau 1232, tau 1233, tau 1234). The gloss means succeeding better (perhaps with some luck, cf. the related verbs at epsilon 3344, tau 435, tau 1147) and enjoying more of the happiness that results from continuing successes; cf. eu)tuxe/w (epsilon 3781, epsilon 3784).
The headword, on the other hand, may reflect the writer's view of tu/xh, and has, for example, the sense of 'trivial' in Zeno (Stoic. 1.70, cf. LSJ). There is no surviving use of the comparative, but it was probably found in Aristophanes, who uses the simple abverb positively at Acharnians 250 and Thesmophoriazusae 303; Etymologicum Magnum 773.3-5 associates this adverb with the present headword.