Expensive
来自Big Physics
early 17th century (in the sense ‘lavish, extravagant’): from Latin expens- ‘paid out’, from the verb expendere (see expend), + -ive.
wiktionary
From Latin expēnsīvus, from expendō; synchronically analyzable as expense + -ive. In the sense of "high-priced" has largely displaced dear.
etymonline
expensive (adj.)
1620s, "given to profuse expenditure," from expense (n.) + -ive. Meaning "costly, requiring profuse expenditure" is from 1630s. Earlier was expenseful (c. 1600). Expenseless was in use mid-17c.-18c., but there seems now nothing notable to which it applies, and the dictionaries label it "obsolete." Related: Expensively; expensiveness.
