SLUGGISH Meaning of SLUGGISH in English a. 1.Indolent, idle, lazy, slothful, dull, inactive, drowsy, inert, dronish, lumpish, supine, phlegmatic.2.Slow.3.Inert, inactive.4.Dull, tame, stupid, simple. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012