Waste
Extravagance
noun, する verb, の adjective
If you wander around doing nothing at your own expense it will be a huge waste of money. It's not like you were doing or buying anything important, you were just wandering around, after all.
ろうひ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
妻の浪費癖がなかなか治らないんです。
My wife’s wasteful habits were not easily cured.