Someone or something that is mysterious is strange and is not known about or understood. 神秘的; 难以理解的
adjective [原级]不可思议的,难以理解的;(人)神秘的,陌生的;保密的,故弄玄虚的
If someone is mysterious about something, they deliberately do not talk much about it, sometimes because they want to make people more interested in it. 诡秘的
mysterious
“ -ous” ⌜ 表示具有某种性质的 - indicating having the quality of ~ ⌟