* Emotional: This is the most general antonym, emphasizing the presence of feelings.
* Passionate: This suggests strong and intense feelings, often about something specific.
* Expressive: This highlights the outward display of emotions.
* Responsive: This suggests a willingness to react to stimuli, including emotional ones.
* Animated: This implies lively and energetic, often accompanied by visible emotions.
* Affected: This can indicate being influenced by emotions, sometimes in a way that seems exaggerated.
* Sentimental: This refers to being easily moved by emotions, often associated with tenderness or nostalgia.
Ultimately, the best antonym for "impassive" will depend on the specific context and the intended nuance.