Antonyms of adj thrifty

2 senses of thrifty

Sense 1
thrifty (vs. wasteful) -- (careful and diligent in the use of resources)

wasteful (vs. thrifty) -- (tending to squander and waste)
        => extravagant, prodigal, profligate, spendthrift -- (recklessly wasteful; "prodigal in their expenditures")
        => pound-foolish -- (unwise in dealing with large sums)
        => uneconomical, uneconomic -- (wasteful of resources)

Sense 2
careful, thrifty -- (mindful of the future in spending money; "careful with money")

INDIRECT (VIA provident) -> improvident -- (not provident; not providing for the future)

Similarity of adj thrifty

2 senses of thrifty

Sense 1
thrifty (vs. wasteful) -- (careful and diligent in the use of resources)
       => economical, frugal, scotch, sparing, stinting -- (avoiding waste; "an economical meal"; "an economical shopper"; "a frugal farmer"; "a frugal lunch"; "a sparing father and a spending son"; "sparing in their use of heat and light"; "stinting in bestowing gifts"; "thrifty because they remember the great Depression"; "`scotch' is used only informally")
       => penny-wise -- (thrifty in small matters only)
       => saving -- (characterized by thriftiness; "wealthy by inheritance but saving by constitution"- Ellen Glasgow)
          Also See-> provident#1

Sense 2
careful, thrifty -- (mindful of the future in spending money; "careful with money")
       => provident (vs. improvident) -- (providing carefully for the future; "wild squirrels are provident"; "a provident father plans for his children's education")