Related formsex·pen·sive·ly, adverbex·pen·sive·ness, nounqua·si-ex·pen·sive, adjectivequa·si-ex·pen·sive·ly, adverbCan be confusedexpansiveexpensive (see synonym study at the current entry)
Synonyms for expensive
Expensive,costly,dear,high-priced apply to something that is high in price. Expensive is applied to whatever entails considerable expense; it suggests a price more than the average person would normally be able to pay or a price paid only for something special: an expensive automobile.Costly implies that the price is a large sum, usually because of the fineness, preciousness, etc., of the object: a costly jewel.Dear is commonly applied in England to something that is selling beyond its usual or just price. In the U.S., high-priced is the usual equivalent.
1620s, "given to profuse expenditure," from expense (n.) + -ive. Meaning "costly" is from 1630s. Earlier was expenseful (c.1600). Expenseless was in use mid-17c.-18c., but there seems nothing now to which it applies, and the dictionaries label it "obsolete."