obnubilate

from WordNet (r) 3.0 (2006)

obnubilate
    v 1: make less visible or unclear; "The stars are obscured by
         the clouds"; "the big elm tree obscures our view of the
         valley" [syn: {obscure}, {befog}, {becloud}, {obnubilate},
         {haze over}, {fog}, {cloud}, {mist}]
    2: make unclear, indistinct, or blurred; "Her remarks confused
       the debate"; "Their words obnubilate their intentions" [syn:
       {confuse}, {blur}, {obscure}, {obnubilate}]

from The Collaborative International Dictionary of English v.0.48

Obnubilate \Ob*nu"bi*late\, v. t. [L. obnubilatus, p. p. of
   obnubilare to obscure. See {Ob-}, and {Nubilate}.]
   To cloud; to obscure. [Obs.] --Burton. -- {Ob*nu"bi*la"tion},
   n. [Obs.] --Beddoes.
   [1913 Webster]