Costly

Definition of Costly
Adjective

1. dearly-won, costly (entailing great loss or sacrifice) "a dearly-won victory"

2. costly, dear, high-priced, pricey, pricy (having a high price) "costly jewelry"; "high-priced merchandise"; "much too dear for my pocketbook"; "a pricey restaurant"

Adverbs for Costly
enormously; appallingly; unreasonably; fearfully; outrageously; unusually; exorbitantly; absurdly; gorgeously; unwarrantably; senselessly; wickedly; elegantly; flagrantly; unbelievably; extremely; inestimably.