1afraid of the slightest thing
2afraid of the head, terrified of the tail (idiom); ever fearful and nervous
Example
tā她kàn看qǐ起lái来kě néng可能yǒu有diǎn点wèi shǒu wèi wěi畏首畏尾de的，dàn但tā她de的yì zhì意志qí其shí实shí fēn十分jiān坚qiáng强。
她看起来可能有点畏首畏尾的，但她的意志其实十分坚强。
She seems timid, but she's actually a strong-willed person.