惘然

tā jiǎ zhuāng zài kàn shū dàn cháng cháng wǎng rán ruò yǒu suǒ sī

她假装在看书，但常常惘然，若有所思。

She pretended to be reading, but often lost in her bad thoughts.

gǎn dào wǎng rán ruò shī

感到惘然若失

feel frustrated and at a loss

tā wǎng rán shēn shǒu qù fú yī xià yǎn jìng dìng shén zài kàn

他惘然伸手去扶一下眼镜，定神再看。

He quickly wiped his glasses with his finger and peered round again.