From WordNet (r) 2.0 (August 2003) [wn]:
groggy
adj : stunned or confused and slow to react (as from blows or
drunkenness or exhaustion) [syn: dazed, foggy,
logy, stuporous]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Groggy \Grog"gy\, a.
1. Overcome with grog; tipsy; unsteady on the legs. [Colloq.]
[1913 Webster]
2. Weakened in a fight so as to stagger; -- said of
pugilists. [Cant or Slang]
[1913 Webster]
3. (Man.) Moving in a hobbling manner, owing to tender feet;
-- said of a horse. --Youatt. Grogram