-ακός

See also: -άκος, ἄκος, and Appendix:Variations of "akos"

Ancient Greek

From -κός (-kós) with an added α from ā-stems and later extended to other nouns; piecewise doublet of -ηκός (-ēkós). Cognate with Proto-Celtic *-ākos (whence Old Irish -ach and Welsh -og), Latin -āx, and perhaps some cases of Proto-Germanic *-agaz (whence Old Norse -agr and Gothic -𐌰𐌲𐍃 (-ags)).

-ᾰκός • (-ăkós) m (feminine -ᾰκή, neuter -ᾰκόν); first/second declension

Added to noun stems to form adjectives: of or pertaining to, in the manner of; -ac
‎καρδίᾱ (kardíā) + ‎-ακός (-akós) → ‎καρδιακός (kardiakós)

‎Αἰγύπτιος (Aigúptios) + ‎-ακός (-akós) → ‎Αἰγυπτιακός (Aiguptiakós)

First and second declension of -ᾰκός; -ᾰκή; -ᾰκόν (Attic)

Number	Singular			Dual			Plural
Case/Gender	Masculine	Feminine	Neuter	Masculine	Feminine	Neuter	Masculine	Feminine	Neuter
Nominative	-ᾰκός -ăkós	-ᾰκή -ăkḗ	-ᾰκόν -ăkón	-ᾰκώ -ăkṓ	-ᾰκᾱ́ -ăkā́	-ᾰκώ -ăkṓ	-ᾰκοί -ăkoí	-ᾰκαί -ăkaí	-ᾰκᾰ́ -ăkắ
Genitive	-ᾰκοῦ -ăkoû	-ᾰκῆς -ăkês	-ᾰκοῦ -ăkoû	-ᾰκοῖν -ăkoîn	-ᾰκαῖν -ăkaîn	-ᾰκοῖν -ăkoîn	-ᾰκῶν -ăkôn	-ᾰκῶν -ăkôn	-ᾰκῶν -ăkôn
Dative	-ᾰκῷ -ăkōî	-ᾰκῇ -ăkēî	-ᾰκῷ -ăkōî	-ᾰκοῖν -ăkoîn	-ᾰκαῖν -ăkaîn	-ᾰκοῖν -ăkoîn	-ᾰκοῖς -ăkoîs	-ᾰκαῖς -ăkaîs	-ᾰκοῖς -ăkoîs
Accusative	-ᾰκόν -ăkón	-ᾰκήν -ăkḗn	-ᾰκόν -ăkón	-ᾰκώ -ăkṓ	-ᾰκᾱ́ -ăkā́	-ᾰκώ -ăkṓ	-ᾰκούς -ăkoús	-ᾰκᾱ́ς -ăkā́s	-ᾰκᾰ́ -ăkắ
Vocative	-ᾰκέ -ăké	-ᾰκή -ăkḗ	-ᾰκόν -ăkón	-ᾰκώ -ăkṓ	-ᾰκᾱ́ -ăkā́	-ᾰκώ -ăkṓ	-ᾰκοί -ăkoí	-ᾰκαί -ăkaí	-ᾰκᾰ́ -ăkắ
Derived forms	Adverb			Comparative			Superlative
Derived forms	-ᾰκῶς -ăkôs			-ᾰκώτερος -ăkṓteros			-ᾰκώτᾰτος -ăkṓtătos
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension.