American Heritage Dictionary
(3)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
Retailers said holiday sales were "sluggish," the Fed researchers wrote.— Boston Business News - Local Boston News | Boston Business Journal
They wake up sluggish, and even more tired than when they went to sleep.— The Toque
The controls are handicapped and sluggish, the plot isnt even C-movie quality, and QTE events make it really hard to hit the bong during cinematics. like? can you mention one that came out that year that was better?— Original Signal - Transmitting Digg
The skeptics 'models tended to assume, quietly, that the pace of technological advance for renewable energy would be sluggish -- significantly raising the costs of trying to cap carbon emissions.— Grist - the Latest from Grist

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about twice a week.