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The word insenescere could not be parsed. Trying a normal dictionary lookup:
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‡ insĕnescĭbĭlis, e, adj. [2. in-senesco], not growing old, undecaying: insenescibilis, ἀγήραος, ἀγήρατος, Gloss. Philox.
in-sĕnesco, nui, 3, v. inch. n., to grow old in or at a thing; constr. with dat. (poet. and post-Aug. prose): insenuit Libris et curis, Hor. Ep. 2, 2, 82: malis, Ov. P. 1, 4, 48: singulis actionum partibus, Quint. 10, 3, 11: iisdem negotiis, Tac. A. 4, 6.