Synonyms of the word 
COSTLINESS → DEARNESS - EXPENSIVENESS - PRECIOUSNESS
costliness
- n. The characteristic of being costly.
dearness
- n. The quality of having great value or price.
expensiveness
- n. The state of being expensive; entailing great expense.
preciousness
- n. The condition of being precious.
If you are interested in words, visit the following sites :
- wiktionary.org/costliness For complete definition of a word
- 1word.ws/costliness to play with words, suffixs, prefixs, etc.