WordWeb Online

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