想不到 (xiǎng bu dào) means “unexpected; hard to imagine; it had not occurred to me; who could have thought that”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
真想不到你会来这里。
Zhēn xiǎng bu dào nǐ huì lái zhèlǐ.
I really didn't expect you would come here.
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