General:
* Flirtatious: Implies playful, suggestive behavior.
* Coquettish: Emphasizes a seductive, alluring manner.
* Playful: Suggests lighthearted teasing, without any malicious intent.
* Wanton: Indicates a more reckless and unrestrained form of teasing.
* Flippant: Implies a careless, disrespectful, and often teasing attitude.
* Bantering: Refers to a playful exchange of teasing remarks.
More negative:
* Taunting: Implies cruel or mocking teasing.
* Derisive: Emphasizes the mocking and scornful nature of the teasing.
* Scornful: Indicates contempt and disdain expressed through teasing.
* Ridiculing: Implies mocking and making someone look foolish.
* Provocative: Suggests teasing that intentionally incites anger or a reaction.
Specific to teasing romantic interest:
* Leading on: Implying a false promise of romantic interest.
* Stringing along: Suggests a deliberate act of keeping someone's hopes up.
* Playing hard to get: Refers to teasing someone by appearing aloof or indifferent.
More informal:
* Joking around: A general term for lighthearted teasing.
* Giving someone a hard time: A common way to describe playful teasing.
* Ragging on someone: A more casual way to say teasing someone.
The best word to use will depend on the context and the specific type of teasing you want to describe.