Etymology and conceptual metaphor; the case of 'in vain' in Greek and Latin

The two Greek adverbs for 'in vain' have sill no good etymology above all because it is difficult to determine tje exact meaning of the connected roots. Yje Author takes into consideration the etymology proposed on the ground of phonetic laws and explains the meaning of the connected roots postulating a conceptual metaphor which is clear also in Latin and in Late Latin. The metaphor, grounded on the concept of a movement that is denied de facto, stremgthens the etymological conjectures.