1.
Something that is ~ has not been used or is not being used at the moment.
...~ containers of food and drink...
ADJ: ADJ n, ADJ after v, v-link ADJ
2.
If you are ~ to something, you have not often done it or experienced it before, so it feels unusual and unfamiliar to you.
Mother was entirely ~ to such hard work.
ADJ: v-link ADJ to n