IPA: /ˈprɒflɪɡətli/
KK: /ˈprɒflɪɡətli/
In a way that shows a lack of care for how resources are used, often wasting them or spending them recklessly.
He spent his money profligately, buying expensive clothes and dining out every night.
Profligately → It is formed from "profligare" (from Latin, meaning to strike down or overthrow) and the adverbial suffix "-ly" (meaning in a manner). The word "profligately" means in a manner that is wasteful or recklessly extravagant, as if one is striking down resources.
Think of someone who is 'overthrowing' ('profligare') their resources by spending them wastefully — that's why profligately means acting in a wasteful manner.