To be coquettish with someone means to behave flirtatiously or playfully towards them. However, there are several other words that can be used to describe this behavior. Some synonyms for being coquettish include coy, alluring, teasing, provocative, seductive, charming, flirty, enticing, and saucy. All of these words have slightly different connotations, but they all suggest a playful and flirtatious behavior. Being coquettish can be perceived as both charming and manipulative, depending on the context. However, in the right situation, being coquettish can be a fun and harmless way to interact with others.