pre-noun adjectival
Refers to something distant from both speaker and listener, or a situation unfamiliar to both. Used before nouns.
See also: あんなに · こんな · そんな · どんな
あんな映画は初めて見た。
I've never seen that kind of movie before.
あんなに高い山に登るのは大変だ。
Climbing such a high mountain is tough.