Translation of "opacus" into English

Munus est hoc, quod contremiscere nos facit, si ad infirmitatem attendimus quae saepe opacos nos efficit et umbris confertos.

This is a daunting task if we consider our human weakness, which so often renders us opaque and full of shadows.

Praecipuum montium Libanum erigit, mirum dictu, tantos inter ardores opacum fidumque nivibus; idem amnem Iordanen alit funditque.

Libanus is the principal mountain, and has, strange to say, amidst these burning heats, a summit shaded with trees and never deserted by its snows.