Flirtatious (adjective)

1. Behaving as though attracted to or trying to attract someone, but for amusement rather than with serious intentions.
2. Playfully or superficially attractive.

Origin:

Mid 16th century (in the sense "trivial, frivolous"): from french flirtatieux, from flirter "to flirt".

Examples:

1. She had a flirtatious smile that caught his attention.
2. He was flirtatious with all the women he met.
3. She was flirtatious and playful with him.
4. He gave her a flirtatious look.
5. Her flirtatious behavior made him feel uncomfortable.