1. 难解：难接近地inaccessibly | 难解obscureness | 难解的abstrusecrabbedenigmaticallabyrinthianunintelligible

2. 暗/难解/朦胧：obscurely /暗地/难解地/朦胧地/ | obscureness /暗/难解/朦胧/ | observational /观察[观测] 的/

noun

1. the quality of being unclear or abstruse and hard to understand

    Synonym: obscurityabstrusenessreconditeness

2. the state of being indistinct or indefinite for lack of adequate illumination

    Synonym: obscurity

3. the state of being humble and unimportant

    Synonym: humblenessunimportancelowliness