unacquainted with

Adjective
1. not knowledgeable about something specified; "American tourists wholly innocent of French"; "a person unacquainted with our customs"
(synonym) innocent of(p), unacquainted with(p)
(similar) uninformed
2. having little or no knowledge of; "unacquainted with city ways"
(synonym) unacquainted(p), unacquainted with(p), unfamiliar with(p)
(similar) unfamiliar

Synonyms and related words:
a novice at, a stranger to, awkward, blankminded, callow, disaccustomed, dumb, empty, empty-headed, fresh, gauche, green, green as grass, groping, ignorant, immature, inane, inexperienced, innocent, know-nothing, naive, nescient, new to, raw, rusty, simple, strange to, tentative, unaccustomed, unaccustomed to, unacquainted, unapprized, uncomprehending, unconversant, unconversant with, undeveloped, unenlightened, unexperienced, unfamiliar, unfamiliar with, unfledged, unhabituated, unhardened, unilluminated, uninformed, uninitiated, uninitiated in, unintelligent, uninured, unknowing, unmatured, unposted, unpracticed, unpracticed in, unripe, unseasoned, unskilled in, unsure, untrained, untried, unused, unused to, unversed, unversed in, unwonted, vacuous, weaned
  

PRATICO DI (QUALCUNO)