Costly
Costly adjective - Commanding a large price.
Usage example: running is one sport that does not require a lot of costly equipment
Reasonable
Reasonable adjective - Costing little.
Usage example: desperately trying to find reasonable hotel rates for the holiday weekend
Costly is an antonym for reasonable.
Both words in one sentence
- Technically, there are ways to produce liquid fuels from gas or coal; the resulting product is costly, but within reasonable limits.
Source: Post Peak Oil - Hydrogen cars are portrayed this way: an exciting new alternative, but one that is inefficient, costly, and distracting from more reasonable solutions to energy problems like better fuel economy standards.
Source: Awesome But Impractical / Film
Cite this Source
Reasonable and Costly. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/costly/reasonable
Costly & Reasonable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/costly/reasonable>.
Reasonable or Costly. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/costly/reasonable.
Google Ngram Viewer shows how "costly" and "reasonable" have occurred on timeline