mystery的形容詞形式是？

The meeting was cloaked in mystery.

會議籠罩着神祕的氣氛。

She's a lady of mystery.

她是一個神祕的女人。

He's a bit of a mystery.

他這個人有點兒神祕。

The dark glasses give her an air of mystery.

這墨鏡使她顯得有些神祕。

His family background is shrouded in mystery.

他的'家庭背景蒙上了神祕的色彩。