expensive
Word family
- expensivelyadverbB1
- expensenounB1
- inexpensiveadjectiveB1
- expendverbB2
- expenditurenounB2
Synonym discussion
Sense: adjective/1
All four words describe something that costs a lot of money, but they differ in register and use. 'Expensive' is the most neutral and widely used term, appropriate in both formal and everyday contexts. 'Costly' sounds more formal and is often chosen for major purchases (a costly renovation) or for figurative costs (a costly mistake). 'Pricey' is informal and common in casual conversation — you might call a coffee 'a bit pricey' but not 'costly'. 'Dear' is a British usage that has become less common over time; older British speakers still use it for everyday items (Everything is so dear now). In American English 'dear' sounds old-fashioned or poetic. For example, a native speaker might say 'The flights were expensive this summer' (neutral), but add 'Bloody pricey!' (informal British) or 'Quite costly when you add the fees' (formal).
Common collocations
Etymology
The word 'expensive' entered English in the early 1600s from the Latin 'expensus', meaning 'weighed out' or 'paid out' — the past participle of 'expendere' (ex- 'out' + pendere 'to weigh, pay'). It originally meant 'given to spending freely, extravagant', describing a person rather than a thing. By the 1700s the meaning shifted to describe things that cost a lot of money, which is how we use it today.