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ἄκαμπτον

From LSJ

L'amor che move il sole e l'altre stelleLove that moves the sun and the other stars

Dante Alighieri, Paradiso, XXXIII, v. 145

Russian (Dvoretsky)

ἄκαμπτον: τό
1 негнущаяся часть (δακτύλου Arst.);
2 непреклонность (πρός и εἴς τι Plut.).