Use the adjective connubial to describe something that relates to marriage or to the relationship between spouses, such as connubial bliss or a connubial argument about who will take out the trash.
Accent the second syllable in connubial: "ka-NEW-bee-ul." The Latin prefix con- means "together" and nubilis means "marriageable," which itself comes from nubere, meaning "take as husband." Nubere is also responsible for the word nubile, which was coined in the 1640s to describe a woman who was considered "marriage material." Today, it refers to a young, attractive woman."