Euxinic is a term commonly used in geology and chemistry to describe marine environments that have extremely low oxygen levels. If you are writing a paper or an article and want to avoid repeating the word euxinic too many times, there are plenty of synonyms that can be used. Some of the other terms that can be used interchangeably with euxinic include anoxic, hypoxic, stagnant, and stagnant anoxic. These words can help to add variety and interest to your writing without sacrificing clarity or accuracy. As with any specialized term, it is important to use them appropriately and in the appropriate context.