1.
If you describe something such as a mountain or cliff as ~, you mean that it is very tall and therefore impressive. (LITERARY)
...~ cliffs of black granite which rise straight out of the sea.
ADJ: ADJ n
2.
If you describe someone or something as ~, you are emphasizing that they are impressive because of their importance, skill, or intensity. (LITERARY)
He remains a ~ figure in modern British politics...
ADJ: ADJ n emphasis