Brit a type of cold dessert made from sponge cake usu soaked in sherry, fruit, jelly, and custard, and topped with whipped cream

something of little value or importance

You know my method. It is founded upon the observance of trifles — Conan Doyle

an insignificant amount of something

(often + with) to behave frivolously, thoughtlessly, or disrespectfully towards somebody or something

He was just trifling with your affections

to talk in a jesting or mocking manner or with intent to delude or mislead

I fear he did but trifle and meant to wreck thee — Shakespeare