From a primary echtho (to hate); hateful (passively, odious, or actively, hostile); usually as a noun, an adversary (especially Satan) -- enemy, foe.

ἐχθρὲ (echthre) − 1 Occurrence

ἐχθροὶ (echthroi) − 6 Occurrences

ἐχθρόν (echthron) − 2 Occurrences

ἐχθρὸς (echthros) − 7 Occurrences

ἐχθροῦ (echthrou) − 1 Occurrence

ἐχθροὺς (echthrous) − 13 Occurrences

ἐχθρῶν (echthrōn) − 2 Occurrences