dangerously steep，precipitous，scarry，ruggedness，steepness ；

[例句] 这个岛屿的凹凸险峻象征着我们的历史和民族性格。 The island's ruggedness symbolises our history and the character of the people.

[例句] 山之险峻,宁有逾此? Could there be a mountain more precipitous than this?

stern，severe，rigorous，grim，austerity ；

[例句] 由于资源的减少，大学正面临严峻的问题。 Universities are facing grave problems because of diminishing resources.

[例句] 我有限的外交手腕儿受到了极其严峻的考验。 My limited diplomatic skills were tested to the utmost.

--

--

--