obnebulate
To cloud or obscure (something).
literary, rare, transitive
The air was obnebulated with murky schemes.
Where it comes from
Borrowed from Medieval Latin obnebulatus, perfect passive participle of obnebulare (“to overcloud”), from ob- + nebula + -are. Compare obnubilate, derived from the unrelated Latin nūbēs.
Adapted from the Wiktionary entry obnebulate (CC BY-SA 4.0).