If someone is sylphlike, they are very thin, graceful, and delicate, like a fairy or an elf.
Being sylphlike is usually thought of as very beautiful and elegant.
Examples:
She moved in a sylphlike way.
The ballerina was sylphlike and danced with grace.
The sylphlike girl floated across the stage.
The sylphlike cat walked lightly on the fence.
Her sylphlike figure made her look like a princess.
The sylphlike flowers danced in the wind.