effusive

Effusive describes an unrestrained, overflowing expression of emotion, typically gratitude, praise, or affection. The primary image is that of a liquid pouring out too quickly to be contained, suggesting a lack of emotional filter.

While often intended as positive, it carries a subtle connotation of excess. To be effusive can sometimes be perceived as insincere, overwhelming, or 'too much' for the given social context, distinguishing it from simply being 'warm' or 'enthusiastic.'

It is most commonly used in formal or semi-formal descriptions of social behavior—such as an "effusive welcome" or "effusive praise"—where the scale of the reaction outweighs the modesty of the occasion.