ADJECTIVE (2)

1. not habituated to; unfamiliar with;
- Example: "unaccustomed to wearing suits"

2. not customary or usual;
- Example: "an unaccustomed pleasure"
- Example: "many varieties of unaccustomed foods"
- Example: "a new budget of unaccustomed austerity"

The Collaborative International Dictionary of English v.0.48:

Unaccustomed \Un`ac*cus"tomed\, a.
   1. Not used; not habituated; unfamiliar; unused; -- with to.
      [1913 Webster]

            Chastened as a bullock unaccustomed to the yoke.
                                                  --Jer. xxxi.
                                                  18.
      [1913 Webster]

   2. Not usual; uncommon; strange; new.
      [1913 Webster]

            What unaccustomed cause procures her hither? --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unaccustomed
    adj 1: not habituated to; unfamiliar with; "unaccustomed to
           wearing suits" [ant: accustomed]
    2: not customary or usual; "an unaccustomed pleasure"; "many
       varieties of unaccustomed foods"; "a new budget of
       unaccustomed austerity"

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "unaccustomed":
   a novice at, a stranger to, callow, curious, disaccustomed, fresh,
   green, green as grass, ignorant, immature, inexperienced, new,
   new to, peculiar, rare, raw, rusty, strange, unaccustomed to,
   unacquainted with, unanticipated, uncommon, unconversant,
   unconversant with, undeveloped, unexpected, unexperienced,
   unfamiliar, unfamiliar with, unfledged, unhabituated, unhardened,
   uninitiated in, uninured, unmatured, unpracticed, unpracticed in,
   unprecedented, unripe, unseasoned, unskilled in, untrained,
   untried, unused, unused to, unusual, unversed, unversed in,
   unwonted, weaned