inscrutable
extremely difficult or seemingly impossible to understand or interpret due to its unclear intent or cause

难以理解的, 不可解的

[形容词]
idiot-proof
designed to be so simple that even someone with little knowledge or skill can use it without making mistakes

傻瓜设计, 非常简单

[形容词]
daunting
intimidating, challenging, or overwhelming in a way that creates a sense of fear or unease

令人畏惧的, 具有挑战性的

[形容词]
convoluted
(of sentences, explanations, arguments, etc.) long and difficult to understand, often due to complexity or excessive detail

复杂的, 曲折的

[形容词]
hard-won
achieving something after facing a lot of challenges and putting in a great deal of effort

艰辛获得的, 费力取得的

[形容词]

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