Meaning of the word "be (all) sweetness and light" in English

What does "be (all) sweetness and light" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be (all) sweetness and light

US /bi ˈɔl ˈswit.nəs ənd laɪt/
UK /bi ˈɔl ˈswit.nəs ənd laɪt/
"be (all) sweetness and light" picture

Idiom

to be very pleasant, kind, and agreeable, often in a way that is not genuine or is used to hide something negative

Example:
She tried to be all sweetness and light, but I could tell she was upset.
Don't expect him to be all sweetness and light after what you said.