Slothful \Sloth"ful\, a. Addicted to sloth; inactive; sluggish; lazy; indolent; idle. [1913 Webster] He also that is slothful in his work is brother to him that is a great waster. --Prov. xviii. 9. [1913 Webster] -- {Sloth"ful*ly}, adv. -- {Sloth"ful*ness}, n. [1913 Webster]