sweetness

Kind and agreeable. Susan's all sweetness and light, I'm sure she's not mad at you.

To be kind and agreeable. Susan's all sweetness and light, I'm sure she's not mad at you.

Cliché very kind, innocent, and helpful. She was mad at first, but after a while, she was all sweetness and light. At the reception, the whole family was all sweetness and light, but they argued and fought after the guests left.

to be very pleasant and friendly, especially when other people are not expecting you to be I was expecting her to be in a foul mood but she was all sweetness and light.

Ostentatious amiability and friendliness, as in One day she has a temper tantrum, the next day she's all sweetness and light. This phrase was coined by Jonathan Swift in his Battle of the Books (1704), where it referred literally to the products of bees: honey and light from beeswax candles. But in Matthew Arnold's Culture and Anarchy (1869), the term meant "beauty and intelligence." In the 20th century, however, it was applied to personal qualities of friendliness and courtesy and to the general pleasantness of a situation, as in Working with him isn't all sweetness and light, you know. Today it is generally used ironically, indicating lack of trust in a person's seeming friendliness or for a difficult situation.