impenetrable

im'penitrәbl

GRE Collins 1

a. not admitting of penetration or passage into or through
s. impossible to understand

a. 不能通过的, 不可理喻的, 费解的, 顽固的

Collins 星级

13,989

BNC 频率

13,690

使用频率

impenetrable 可以分解为前缀 im-（表示否定）和词根 penetrable（可穿透的）。整体意思是“不可穿透的”。

例句

1. The forest was so thick that it felt impenetrable.

森林茂密得让人觉得无法穿透。

2. His emotions were impenetrable, making it hard for others to understand him.

他的情感难以捉摸，让别人很难理解他。

3. The security system was designed to be impenetrable to intruders.

这个安全系统旨在对入侵者不可渗透。