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Adjective: wasteful  weyst-ful
  1. Tending to squander and waste
  2. Inefficient in use of time and effort and materials
    "a clumsy and wasteful process"; "wasteful duplication of effort";
    - uneconomical
  3. Laying waste
    "when wasteful war shall statues overturn"

See also: destructive, extravagant, improvident, inefficient, pound-foolish, prodigal, profligate, spendthrift, uneconomic, uneconomical

Antonym: thrifty

Encyclopedia: Wasteful