unaccustomed (adj.)

• callow
• curious
• fresh
• green
• ignorant
• immature
• inexperienced
• new
• peculiar
• rare
• raw
• rusty
• strange
• unanticipated
• uncommon
• undeveloped
• unexpected
• unfamiliar
• unfledged
• unhardened
• unpracticed
• unprecedented
• unripe
• unseasoned
• untrained
• untried
• unused
• unusual
• unversed
• unwonted
• weaned