1. not having been used; still new or in original condition
2. not being utilized or employed

Examples

• She found an unused notebook in her desk drawer.
• The unused vacation days will expire at the end of the year.
• There are several unused rooms in the old mansion.
• He sold his unused exercise equipment online.
• The unused portion of the grant must be returned.
• An unused talent is a wasted opportunity.
• The unused parking spaces were converted into a garden.