English translation (word)
English translation (etymon)
Ἀργαλέος· χαλεπός· οἶμαι παρὰ τὸν Ἄρην, τὸν πόλεμον, ἀραλέος καὶ πλεονασμῷ τοῦ γ ἀργαλέος. ἢ παρὰ τὸ ἄλγος, ὁ λύπας καὶ κακὰ ἐμποιῶν
Argaleos "painful": I think it comes from Ares, meaning "war" : *araleos and through adjunction of [g], argaleos. Or it comes from algos "pain", and means he who produces evil and sorrow
This is a contextual etymology, relying on the association of ἀργαλέος with πόλεμος in Homer (Il. 14.87 ἀργαλέους πολέμους) and in later authors (Quintus Smyrnaeus, Posthom. 7.365 ἀργαλέου […] ἀπ᾽ Ἄρεος), or with other words meaning "fight" (Il. 11.278 φύλοπιν ἀργαλέην "painful battle").
There are no parallels in ancient sources, unless one assumes that Quintus Smyrnaeus, Posthom. 7.365 ἀργαλέου […] ἀπ᾽ Ἄρεος is an etymological figura alluding to that etymology.