n. wonder
misc. be puzzled
捉摸不透 Difficult to ascertain ; Unpredictable
你反复无常，让人捉摸不透。
You are inconsistent and unpredictable.
《柯林斯英汉双解大词典》
他这个人完全让人捉摸不透。
He is utterly unpredictable.
我已认识他多年，可还是摸不透他的脾气。
I've known him for years, but I still don't know what pushes his buttons.
《牛津词典》
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