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unfathomable + noun
The scientist pondered the unfathomable mystery of the universe.
科学家思索着宇宙深不可测的奥秘。
难以理解的；无法理解的
先理解核心含义，再看它在真实句子里的用法。
难以理解的；无法理解的
Impossible to understand or comprehend.
The scientist pondered the unfathomable mystery of the universe.
科学家思索着宇宙深不可测的奥秘。
深不可测的；不可理解的。
Impossible to fathom.
深不可测的
of depth; not capable of being sounded or measured
深如深渊,无法测量
resembling an abyss in depth; so deep as to be unmeasurable
无法理解的
impossible to come to understand
The new rules were so confusing that the reason behind them was unfathomable even to the manager.
新规定让人如此困惑，连经理都无法理解其背后的原因。
It is unfathomable how she managed to finish the marathon with such a bad knee.
让人无法理解的是，她的膝盖伤得那么重，竟然还能跑完马拉松。
To anyone who has not studied philosophy, the essay's arguments are completely unfathomable.
对于没有学过哲学的人来说，这篇文章的观点完全难以理解。
The scientist pondered the unfathomable mystery of the universe.
科学家思索着宇宙深不可测的奥秘。
The depth of the ocean is unfathomable.
海洋的深度深不可测。
表示‘对……来说不可理解’
His actions remain unfathomable to us.
他的行为对我们来说仍然难以理解。
Not this
I cannot unfathom the meaning of this poem.
Use this
The meaning of this poem is unfathomable.
Unfathomable 是形容词，不能用作动词。应使用系表结构来表达 "不可理解"。
Not this
He smiled unfathomable.
Use this
His smile was unfathomable.
Unfathomable 是形容词，不能修饰动词。应作为表语使用，描述主语的特征。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
无法理解的谜团
The origin of the universe remains an unfathomable mystery.
宇宙的起源仍然是一个无法理解的谜团。
难以测量的深度
No one has ever measured the unfathomable depth of the ocean trench.
没有人测量过海沟那难以测量的深度。
深不可测的深渊
The ship disappeared into an unfathomable abyss.
那艘船消失在深不可测的深渊中。
深不可测的悲伤
Behind her calm smile lay unfathomable sadness.
在她平静的微笑背后隐藏着深不可测的悲伤。
令人无法理解的复杂性
The scientist struggled with the unfathomable complexity of the data.
这位科学家难以应对数据那令人无法理解的复杂性。
哦，神的智慧与知识何其深奥！他的判断何等难测，他的道路何等深不可测！
The Bible describes God's ways as unfathomable, meaning beyond human understanding.
《圣经》将上帝的道路描述为深不可测，即超出人类的理解。
Use unfathomable naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住 fathom（英寻）是测水深的单位，像一根探底的绳；un- 加 -able 表示绳子探不到底，所以是深不可测，又引申为无法理解。
语域：formal 常见场景：formal writing、literary prose、serious news commentary unfathomable 通常属于较正式、有文学色彩的用词，多用于书面语、严肃报道或修辞性表达；口语中较少直接使用，若想表达“难以理解”，日常更常说 impossible to understand。
通常用作定语或表语，描述事物深不可测。
Dictionary facts from ECDICT, WIKTIONARY.