I don't know how, what, why, etc.
informal› used to add force to criticisms, expressions of surprise, etc.:
I don't know why you bother.
(I don't know how, what, why, etc.在劍橋高級學習詞典和同義詞詞典的解釋 ©劍橋大學出版社)
「每日一詞」
likeable
A likeable person is pleasant and easy to like.