waste·ful 
/ˈweɪstfəl/ adjective
/ˈweɪstfəl/ adjective [more wasteful; most wasteful] : using more of something than is needed : causing something valuable to be wasted
▪ a wasteful use of natural resources ▪ a careless and wasteful person ▪ It was a wasteful [=unnecessary] duplication of effort. ▪ We must eliminate wasteful expenditures.
▪ a wasteful use of natural resources ▪ a careless and wasteful person ▪ It was a wasteful [=unnecessary] duplication of effort. ▪ We must eliminate wasteful expenditures.
— waste·ful·ly adverb
— waste·ful·ness noun [noncount]
