Herbert Weir Smyth, A Greek Grammar for Colleges

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[*] 345. Comparison of Adverbs.—In adverbs derived from adjectives the comparative is the same as the neuter singular of the comparative of the adjective; the superlative is the same as the neuter plural of the superlative adjective.

σοφῶς	wisely	σοφώτερον	σοφώτατα
χαριέντως	gracefully	χαριέστερον	χαριέστατα
εὐδαιμόνως	happily	εὐδαιμονέστερον	εὐδαιμονέστατα
καλῶς	well	κάλλι_ον	κάλλιστα
ἡδέως	pleasantly	ἥδι_ον	ἥδιστα
		ἧττον less (319, 2）	ἥκιστα
εὖ	well	ἄμεινον	ἄριστα
(adv. of ἀγαθός good）
μάλα	very	μᾶλλον	μάλιστα

a. Adverbs of place ending in ω, and some others, retain ω in the comparative and superlative.

ἄνω	above	ἀνωτέρω	ἀνωτάτω
πόρρω	afar	πορρωτέρω	πορρωτάτω

b. ἐγγύς near has ἐγγύτερον (-τέρω), ἐγγυτάτω (-τατα rare). πρῴ early has πρωϊαίτερον, πρωϊαίτατα.

c. There are some forms in -ως from comparatives: ἀσφαλεστέρως (ἀσφαλέστερον) more securely, βελτι_όνως (βέλτι_ον) better. Superlatives in -ον are usually poetic; as μέγιστον.