The phrase "in the state of matrimony" refers to the condition of being married. There are several synonyms that can be used in place of this phrase depending on the context and tone of the sentence. Some alternatives could be "married," "wed," "hitched," "spliced," "united in marriage," "in holy matrimony," or "joined in wedlock." Each of these synonyms conveys the same meaning as "in the state of matrimony." Furthermore, they can be used interchangeably in different contexts and writing styles. Therefore, one can choose the synonym that best suits their intended meaning or writing style.