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Otro diccionario
unfamiliar 
1 alien, beyond one's ken, curious, different, little known, new, novel, out-of-the-way, strange, unaccustomed, uncommon, unknown, unusual 
2  (with)   with a stranger to, inexperienced in, unaccustomed to, unacquainted, unconversant, uninformed about, uninitiated in, unpractised in, unskilled at, unversed in 
 
Antonyms  
 accustomed, acquainted, average, common, commonplace, conversant, everyday, experienced, familiar, knowledgeable, normal, unexceptional, well-known, well-versed