menacing

The menacing clouds on the horizon made us hurry back to the beach.

用法提示：menacing 是形容词，作定语修饰 clouds，表示‘威胁的、吓人的’。

His tone became increasingly menacing during the argument.

用法提示：menacing 是形容词，作表语，与系动词 became 搭配，表示‘带有威胁性的’。

She found his silent stare menacing.

用法提示：menacing 是形容词，作宾语补足语，说明 stare 带给人的威胁感。