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From The Collaborative International Dictionary of English v.0.48:
Wasteful \Waste"ful\, a. 1. Full of waste; destructive to property; ruinous; as, wasteful practices or negligence; wasteful expenses. [1913 Webster] 2. Expending, or tending to expend, property, or that which is valuable, in a needless or useless manner; lavish; prodigal; as, a wasteful person; a wasteful disposition. [1913 Webster] 3. Waste; desolate; unoccupied; untilled. [Obs.] [1913 Webster] In wilderness and wasteful desert strayed. --Spenser. [1913 Webster] Syn: Lavish; profuse; prodigal; extravagant. [1913 Webster] -- Waste"ful*ly, adv. -- Waste"ful*ness, n. [1913 Webster]