Sloth'ful adjective Addicted to sloth; inactive; sluggish; lazy; indolent; idle. « He also that is slothful in his work is brother to him that is a great waster.» Prov. xviii. 9. -- Sloth'ful*ly , adverb -- Sloth'ful*ness , Found on http://www.encyclo.co.uk/webster/S/124