From WordNet (r) 2.0 (August 2003) [wn]:
foggy
adj 1: filled or abounding with fog or mist; "a brumous October
morning" [syn: brumous, hazy, misty]
2: stunned or confused and slow to react (as from blows or
drunkenness or exhaustion) [syn: dazed, groggy,
logy, stuporous]
3: indistinct or hazy in outline; "a landscape of blurred
outlines"; "the trees were just blurry shapes" [syn:
bleary, blurred, blurry, fuzzy, hazy, muzzy]
4: obscured by fog; "he could barely see through the fogged
window" [syn: fogged]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Foggy \Fog"gy\, a. [Compar. Foggier; superl. Foggiest.]
[From 4th Fog.]
1. Filled or abounding with fog, or watery exhalations;
misty; as, a foggy atmosphere; a foggy morning. --Shak.
[1913 Webster]
2. Beclouded; dull; obscure; as, foggy ideas.
[1913 Webster]
Your coarse, foggy, drowsy conceit. --Hayward.
[1913 Webster]