connubial \kuh-NOO-bee-ul; -NYOO-\ (adjective) - Of or pertaining to marriage, or the marriage state; conjugal; nuptial.
"How many men can truly assert that they ever enjoy connubial flows of soul, or that connubial feasts of reason are in their nature enjoyable?" -- Anthony Trollope, 'Framley Parsonage'
Connubial comes from Latin conubialis, from conubium, "marriage, intermarriage," from con-, "with, together" + nubere, "to veil, to marry." It is related to nubile, "of an age suitable for marriage; hence, sexually mature and attractive."