Synonyms for affair:
love life, extramarital, party, deceive, dalliance, play around, love affair, cheat on, cuckold, fling, Adulterer, fidelity, in flagrante delicto, infidelity, relationship, unfaithful, event, adulterous, two-time, theme, love triangle, misalliance, soiree, courtship, adultery, monogamy.
Sense 1 (noun)
Sense 2 (noun)
Sense 3 (noun)
incident, event, occurrence.
Sense 4 (noun)
Sense 5 (noun)
Sense 6 (noun)
livelihood, vocation, partnership, enterprise, business, barter, negotiation, trade, proprietorship, career, calling, busy work, selling, assignment, situation, practice, position, industry, concern, activity, commission, posting, firm, venture, service, occupation, company, employment, merchant, profession, commerce, management, exchange, station, holding, job, transaction, market, specialty, corporation, labor, establishment, retailing, consortium, interest.
illicit sexual relationship (noun)
love affair (noun)
matter or business to be taken care of; happening activity (noun)
interest, episode, occurrence, duty, concern, profession, incident, calling, circumstance, hap, thing, event, transaction, happening, project, task, employment, assignment, topic, subject, undertaking, job, pursuit, case, avocation, occupation.