SYN: Expenditure, outlay, disbursement, payment, compensation, price, worth, expense, charge, outgoings.
ANT: Receipt, income, emolument, return, profit, perquisite, revenue.
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KEY: Costly.
SYN: Valuable, expensive, high-priced, rich, precious, sumptuous.
ANT: Valueless, cheap, low-priced, mean, worthless, beggarly, paltry.
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KEY: Costume.
SYN: Uniform, livery, robes.
ANT: Disguise, transformation, incognito.