ADVERBS
1. Formation. — Adverbs derived from adjectives have the ending ‑ως. With the exception of the final consonant ς, they perfectly agree in form and accent with the genitive plur. masc. of the respective adjectives.
E.g.
σοφός wise, gen. plur. σοφῶν, adv. σοφῶς,
δίκαιος just, δικαίων, δικαίως,
ἁπλοῦς simple, ἁπλῶν, ἁπλῶς,
πᾶς all, πάντων, πάντως,
εὐδαίμων happy, εὐδαιμόνων, εὐδαιμόνως,
σαφής clear, gen. plur. σαφῶν, adv. σαφῶς,
συνήθης customary, συνήθων, συνήθως,
ἡδύς sweet, ἡδέων, ἡδέως.
2. Sometimes the neuter of an adjective serves as adverb, e.g. ταχύ quickly, πολύ much, μικρόν a little; ἀγαθός good has εὖ well, bene.
3. Comparison. — The degree of comparison in adverbs which are derived from adjectives is expressed
in the comparative by the acc. sg. neut.,
in the superlative by the acc. pl. neut. of the adjective.
Examples:
σοφῶς wisely → σοφώτερον, σοφώτατα,
ἁπλῶς simply → ἁπλούστερον, ἁπλούστατα,
εὐδαιμόνως happily → εὐδαιμονέστερον, εὐδαιμονέστατα,
σαφῶς clearly → σαφέστερον, σαφέστατα.
So also:
εὖ well → ἄμεινον, ἄριστα,
μάλα much, very → μᾶλλον more, rather, μάλιστα (the) most, especially.
4. Rare are such forms of comparison as μειζόνως (besides μεῖζον) and πλουσιωτέρως (besides πλουσιώτερον), ἐχθροτέρως (besides the more common ἔχθιον).
5. Local adverbs too may be compared. Their degrees often end in ‑ω.
Examples:
ἐγγύς near → ἐγγύτερον, ἐγγύτατα, and ἐγγυτέρω, ἐγγυτάτω,
πόρρω far off → πορρωτέρω, πορρωτάτω.