5
inefficient(adjective, slow, extravagant, incompetent, lavish)
5
unrestrained(adjective, free, careless, wild, grand)
4
bootless
4
careless(adjective, casual, extravagant, incompetent, lavish)
4
ineffective(adjective, incompetent, unproductive)
4
intemperate(adjective, free, careless, wild, grand)
4
overgenerous(adjective, extravagant, lavish, excessive, profligate)
4
uneconomic
4
unproductive(adjective, slow, incompetent)
4
useless(adjective, incompetent, unproductive)
3
liberal(adjective, grand, extravagant, generous, lavish)
3
baneful
3
consuming
3
consumptive(adjective, destructive)
3
dissipative(adjective, extravagant, lavish, economical, thriftless)
3
incompetent(adjective, unproductive)
3
indulgent(adjective, excessive, expensive, steep, high-priced)
3
opulent(adjective, grand, extravagant, generous, abundant)
3
wanton(adjective, free, careless, wild, extravagant)
2
waste
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APASmart Define. (2016). wasteful thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/wasteful/thesaurus/synonyms
ChicagoSmart Define. 2016. "wasteful thesaurus" https://smartdefine.org/wasteful/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, wasteful thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/wasteful/thesaurus/synonyms>.
MLASmart Define. "wasteful thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/wasteful/thesaurus/synonyms>