<p><strong>Adjective</strong></p><ul><li>indisposed to action or exertion; lacking in energy; lazy; indolent: a sluggish disposition.</li><li>Synonyms: slothful, slow</li><li>Antonyms: active, quick</li><li>not acting or working with full vigor, as bodily organs: a sluggish liver.</li><li>slow to act or respond: a sluggish car engine.</li><li>moving slowly, or having little motion, as a stream.</li><li>slow, as motion.</li><li>slack, as trade, business, or sales.</li></ul>