nimbosus
From LSJ
τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
Latin > English (Lewis & Short)
nimbōsus: a, um, adj. nimbus,
I full of storms, stormy, rainy (cf.: nubilus, nebulosus): fluctu nimbosus Orion, Verg. A. 1, 535: ventus, Ov. P. 2, 3, 27: aër, Luc. 5, 631: bruma, Stat. S. 1, 3, 89: montes, Plin. 18, 11, 29, § 109: ver, Juv. 4, 87: urbs, i. e. Rome, Plin. 26, 3, 8, § 16.
