The Homeric Greek word ἄαπτος
Word ἄαπτος
á a p t o ς
Transliteration aaptos
Meaning not to be touched, resistless, invincible

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Iliad

Other words that might be of interest
ἁπαλός ‘soft to the touch, tender’, ἄγωνος ‘without angle’, ἄκουσις ‘hearing’, ἀβληχρής ‘mild, soothing’, ἀγανός ‘mild, gentle’, ἀκαλαρρείτης ‘soft-flowing’, ἀκέων ‘softly, silently’, ἀκήν ‘softly, silently’, ἀκοή ‘hearing, sound heard’, ἀκούω ‘hear’, ἀκουάζομαι ‘hear, listen to’, ἀκουή ‘hearing’, ἀμαλδύνω ‘soften, mitigate’, ἀμαλός ‘soft, weak’, ἀπηνής ‘ungentle, rough, hard’, ἀταλός ‘tender, delicate’, ἐπακούω ‘hear’, ἐπικλύω ‘listen to, hear’, λάχνη ‘soft woolly hair, down’, μαλακός ‘soft’, μαλθακός ‘soft’, μειλίσσω ‘make mild, soothe, treat kindly’, μειλίχιος ‘gentle, soothing’, μειλιχία ‘gentleness, softness’, θελκτήριος ‘enchanting, soothing’, τέρην ‘soft, delicate’, ἀτέραμνος ‘unsoftened, hard’, γαλαθηνός ‘sucking, young, tender’, πτίλον ‘soft feathers’, θάλπω ‘heat, soften by heat’