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adjective common, well-known
Synonyms: accustomed, commonplace, conventional, customary, domestic, everyday, frequent, garden variety, habitual, homespun, household, humble, informal, intimate, known, matter-of-fact, mundane, native, natural, old hat, ordinary, plain, prosaic, proverbial, recognizable, repeated, routine, simple, stock, unceremonious, unsophisticated, usual, wonted, workaday
Antonyms: foreign, new, strange, uncommon, undistinguished, unfamiliar, unknown, unremarkable
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adjective knowledgeable
Synonyms: abreast, acquainted, apprised, at home with, au courant, au fait, aware, cognizant, conscious, conversant, grounded, informed, in on, in the know, introduced, kept posted, mindful, no stranger to, plugged in, savvy, tuned in, up, up on, versant, versed in, well up in, with it
Antonyms: ignorant, unacquainted, unknowledgeable
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adjective friendly, bold
Synonyms: affable, amicable, buddy-buddy, chummy, close, comfortable, confidential, cordial, cozy, dear, easy, forward, free, free-and-easy, fresh, genial, gracious, impudent, informal, intimate, intrusive, near, neighborly, nervy, obtrusive, officious, open, palsy, palsy-walsy, presuming, presumptuous, relaxed, sassy, smart, snug, sociable, thick, tight, unceremonious, unconstrained, unreserved, wise
Antonyms: aloof, cold, cool, distant, reserved, unapproachable, unfamiliar, unfriendly