What is another word for "casual"?

Roget's Thesaurus (1911) lists these synonyms for "casual": accord, acquaintance, advocate, all, ally, alter, ambo, amigo, and, associate, autocratic, auxiliary, bedfellow, best, bid, boon, bosom, chamber, childhood, choice, chum, classman, classmate, colleague, companion, compatriot, compeer, comrade, confidante, confrere, copartner, countryman, crony, deliberately, discretion, discretional, discretionary, divine, ego, est.