Abreast, Accustomed, Acquainted, Affable, Amicable, Apprised, Associate, Au courant, Au fait, Aware, Buddy-buddy, Chummy, Conversant, Familiar, Companion, Comrade, Fellow, Familiar spirit, Commonplace, Conventional, Customary, Domestic, Everyday, Frequent, Cognizant, Conscious, Close, Comfortable, Confidential, Cordial, Cozy, Dear, Easy, Forward, Free, Free-and-easy, Intimate, Habitual, Homespun, Household, Humble, Informal, Known, Mundane, Native, Natural, Old hat, Ordinary, Plain, Prosaic, Proverbial, Recognizable, Repeated, Routine, Simple, Stock, Grounded, In on, In the know, Informed, Introduced, Mindful, Savvy, Fresh, Genial, Gracious, Impudent, Intrusive, Near, Neighborly, Nervy, Obtrusive, Officious, Open, Palsy, Palsy-walsy, Presuming, Presumptuous, Relaxed, Sassy, Smart, Snug, Sociable, Thick, Unceremonious, Unsophisticated, Usual, Wonted, Workaday, Tuned in, Up on, Up, Versant, With it, Tight, Unconstrained, Unreserved, Wise

Unfamiliar, Strange, Foreign, New, Uncommon, Undistinguished, Unknown, Unremarkable, Ignorant, Unacquainted, Unknowledgeable, Aloof, Cold, Cool, Distant, Reserved, Unapproachable, Unfriendly