un·used 
/ˌʌnˈju:zd/ adjective
/ˌʌnˈju:zd/ adjective [more unused; most unused] 1 : not being used : not having been used before
▪ unused airline tickets ▪ unused disk space ▪ The library has been unused for 10 years. 2 : available for use in the future
▪ I have four days of unused vacation time left.
▪ unused airline tickets ▪ unused disk space ▪ The library has been unused for 10 years.
▪ I have four days of unused vacation time left.
un·used to /ˌʌnˈju:st-/
/ˌʌnˈju:st-/ : not familiar or comfortable with (something) : not used to (something)
▪ He is unused to large crowds. ▪ I was unused to being awake so late at night.
▪ He is unused to large crowds. ▪ I was unused to being awake so late at night.
