a novice at, a stranger to, callow, disaccustomed, fresh, green, green as grass, ignorant, immature, inexperienced, new to, raw, rusty, unaccustomed, unaccustomed to, unacquainted with, unconversant, unconversant with, undemonstrated, undeveloped, unexperienced, unfamiliar with, unfledged, unhabituated, unhardened, uninitiated in, uninured, unmatured, unpracticed in, unproved, unripe, unseasoned, unskilled in, untested, untrained, untried, unused, unused to, unversed, unversed in, unwonted, weaned