1. 浪费：extravagance 奢侈 | extravagancy 浪费 | extravagant 奢侈的
2. 浪费/挥霍：extravagance /浪费/挥霍无度/毫无道理的/过度/放肆的言行/ | extravagancy /浪费/挥霍/ | extremeness /极端/非常/最后/
extravagancy的反义词
noun
1. the quality of exceeding the appropriate limits of decorum or probability or truth
e.g. we were surprised by the extravagance of his description
Synonym: extravagance