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Definition of wasteful : 1. 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.
2. Full of waste; destructive to property; ruinous; as, wasteful practices or negligence; wasteful expenses.
3. Waste; desolate; unoccupied; untilled.

Synonyms:

out of bounds, excess, with money to burn, reckless, careless, without stint, unthrifty, overgenerous, improvident, full-handed, spendthrift, destructive, careful, uneconomical, dissipated, incontinent, squandering, liberal, save, uneconomic, inefficient, easy come easy go, cavalier, wild

gluttonous, profuse, opulent, thriftless, unrestrained, extravagant, immoderate, pound-foolish, profligate, unconstrained, overindulgent, overabundant, prodigal, indulgent, lavish, overflowing

Usage examples:

• Even the King found his extravagance checked, and Imperial schemes were delayed and turned from mere wasteful squanderings to some good purpose. - "Korea's Fight for Freedom", F.A. McKenzie.
• Thus a wasteful loss is avoided. - "The Birth-Time of the World and Other Scientific Essays", J. (John) Joly.
• Hal, who was wasteful even in his good- nature, threw a whole queen cake to the dog, who swallowed it for a single mouthful. - "The Parent's Assistant", Maria Edgeworth.