IPA: /ɪkˈspɛnsɪvli/
KK: /ɪkˈspɛnsɪvli/
In a way that costs a lot of money or is very costly.
She always dresses expensively, wearing designer clothes.
Expensively → It is formed from "expensive" (from Latin "expensivus", meaning costly or requiring a lot of expenditure) and "-ly" (meaning in a manner of). The word "expensively" means in a manner that requires a lot of expenditure or is costly.
Think of something that is 'costly' ('expensive') and how it is done 'in a manner of' ('-ly'). This helps you remember that 'expensively' means doing something in a costly way.