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Webster 1913 Edition

Adj.

Without thrift; not prudent or prosperous in money affairs.

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Thrift′less-ly

adv.

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Thrift′less-ness

Noun.

Adj.

Having no frugality or good management; profuse; extravagant; not thriving.

thriftless ‎(comparative more thriftless, superlative most thriftless)