Lewis Short
ob-nūbĭlo, āvi, ātum, 1
* V. a., to cover with clouds or fog; to overcloud, darken, obscure (post-class.): vultūs serenitatem,Gell. 1, 2, 5: haec omnia vitium,to obscure,Amm. 28, 4, 2: odore sulfuris obnubilatus,beclouded, stupefied, senseless,App. M. 9, p. 228, 22; so, animam,id. ib. 8, p. 204, 38.
Charlton T. Lewis, Charles Short, A Latin Dictionary