Obnubilate

Definition: (from dictionary.com)
-verb, used with object
1. to cloud over; becloud; obscure

Examples:
"The sky began to obnubilate and the rain soon followed."
"It seemed like he was trying to obnubilate the facts to confuse me."

Origin: (from etymonline.com)
"1580s, from L. obnibulatus, pp. of obnubilare 'to cover with clouds or fog,' from ob- (see ob-) + verb from L. nubes 'cloud' (see nuance)."

Awkwardness rating: 6

A cloud's favorite activity is to obnubilate. (etsy.com)