We found 11 dictionaries that define the word costlier:

General (10 matching dictionaries)

1. costlier: Merriam-Webster
2. costlier: Oxford Learner's Dictionaries
3. costlier: Collins English Dictionary
4. costlier: Vocabulary.com
5. Costlier, costlier: Wordnik
6. costlier: Cambridge Advanced Learner's Dictionary
7. costlier: Wiktionary
8. costlier: Dictionary.com
9. costlier: Cambridge Essential American English Dictionary
10. costlier: TheFreeDictionary.com

Business (1 matching dictionary)

11. costlier: Legal dictionary

(Note: See costly as well.)

Definitions from Wiktionary (costly) ▸ adjective:  Of high cost; expensive. ▸ Also see costly ▸ Words similar to costlier ▸ Usage examples for costlier ▸ Idioms related to costlier ▸ Wikipedia articles (New!) ▸ Popular nouns described by costlier ▸ Words that often appear near costlier ▸ Rhymes of costlier ▸ Invented words related to costlier