Pronunciation: (slug'ish),[key] —adj. 1. indisposed to action or exertion; lacking in energy; lazy; indolent: a sluggish disposition. 2. not acting or working with full vigor, as bodily organs: a sluggish liver. 3. slow to act or respond: a sluggish car engine. 4. moving slowly, or having little motion, as a stream.
5. slow, as motion.
6. slack, as trade, business, or sales.