verb (used with object), ob·nu·bi·lat·ed, ob·nu·bi·lat·ing.
- to cloud over; becloud; obscure.
- (tr) literary to darken or obscure
v.1580s, from Latin obnibulatus, past participle of obnubilare “to cover with clouds or fog,” from ob- (see ob-) + verb from Latin nubes “cloud” (see nuance). Related: Obnubilated; obnubilating; obnubilation.