What does acharneus mean in Latin?

acharneus, a adjective, means “Acharnanian (relating to Acharnae)”.

How do you pronounce acharneus?

In classical Latin, [aˈkʰar.ne.ʊs]; in ecclesiastical (church) Latin, [aˈkar.ne.us].

adjectivefirst/second-declension adjective

acharneus (feminine acharnea, neuter acharneum)

Classical[aˈkʰar.ne.ʊs]Ecclesiastical[aˈkar.ne.us]

singular
form	masculine	feminine	neuter
nominative	acharneus	acharnea	acharneum
genitive	acharneī	acharneae	acharneī
dative	acharneō	acharneae	acharneō
accusative	acharneum	acharneam	acharneum
ablative	acharneō	acharneā	acharneō
vocative	acharnee	acharnea	acharneum

plural
form	masculine	feminine	neuter
nominative	acharneī	acharneae	acharnea
genitive	acharneōrum	acharneārum	acharneōrum
dative	acharneīs	acharneīs	acharneīs
accusative	acharneōs	acharneās	acharnea
ablative	acharneīs	acharneīs	acharneīs
vocative	acharneī	acharneae	acharnea

Borrowed from Ancient Greek Ἀχαρνεύς (Akharneús).