WordNet sense 1 (stunned or confused and slow to react (as from blows or drunkenness or exhaustion)):

dazed, groggy, logy, stuporous

WordNet sense 2 (deficient in alertness or activity):

lethargic, unergetic

WordNet sense 3 (indistinct or hazy in outline):

bleary, blurred, blurry, fuzzy, hazy, muzzy

WordNet sense 4 (not clearly defined or easy to perceive or understand):

indistinct

WordNet sense 5 (filled or abounding with fog or mist):

brumous, misty

WordNet sense 6 (full of or covered with clouds):

cloudy

WordNet sense 7 (obscured by fog):

fogged

WordNet sense 8 (not clear; not transmitting or reflecting light or radiant energy):

opaque