unused = not used; fresh; new
- You can get a refund on the unused tickets.
- All the unused cheque leaves were surrendered to the bank.
- Unused car, unused furniture, etc.
disused = no longer being used; abandoned
- Beware of the disused well near the playground.
- This bridge was used until the 2000s and then fell into disuse.
- Long periods of disuse can damage batteries.
- Disused mine, disused warehouse, etc.
Unused to also means unaccustomed to
- She was quite unused to this way of life