A lack of thriftiness; prodigality. / (now rare) Someone who is not thrifty; a spendthrift, someone who is not careful with their money.

Unthrifty.

plural of unthrift

Not thrifty: wasteful, extravagant; unproductive.

The quality of being unthrifty.

In a way that is not thrifty. / (obsolete) In an immoral or dissolute manner.

superlative form of unthrifty: most unthrifty

(obsolete) unthriftiness

comparative form of unthrifty: more unthrifty