Dear, costly, pricey, valuable, extortionate, priceless.
Expensive ...
Cheap
another word for overpriced is expensive
Lavish or costly.
costly
expensive
"Ancient" is another word for very old.
Some people use the word dear.
another word for very large
An afternoon out is the hint word for another word for a very special afternoon. An afternoon date is another word for the same.
Note that "least expensive" is two words. The least expensive item in our restaurant is the white rice.
Another word for 'very bad' is, "Heinous" (HAY nuss). Another word is, "Dire".