1.
If you are ~ to something, you do not know it very well or have not experienced it very often. (WRITTEN)
They were ~ to such military setbacks...
It is a part of Britain as yet largely ~ to tourists.
= unused
? accustomed
ADJ: v-link ADJ to n/-ing
2.
If you describe someone’s behaviour or experiences as ~, you mean that they do not usually behave like this or have experiences of this kind. (WRITTEN)
He began to comfort me with such ~ gentleness...
ADJ: ADJ n