effusive
Showing feelings very openly and excitedly, almost overflowing.
Effusive means expressing feelings, especially approval or gratitude, in an unrestrained and overflowing way. When someone is effusive, their emotions pour out freely and abundantly, like water gushing from a fountain.
Picture a fan meeting their favorite author and becoming so excited they can barely get the words out as they heap praise upon praise, or a grandmother seeing her grandchildren after months apart and showering them with hugs, kisses, and delighted exclamations. That's being effusive: showing feelings openly and enthusiastically, sometimes almost too much.
The word often describes praise or thanks. An effusive thank-you note might go on for paragraphs about how wonderful and thoughtful a gift was. An effusive greeting involves warm hugs, exclamations, and genuine delight. While effusive feelings are sincere, they can sometimes make others uncomfortable if they overflow too much. There's a difference between saying “Thanks, I really appreciate it” and writing three pages about how someone's simple favor changed your entire life.
When you're effusive, you're not holding back or being reserved; you're letting your feelings flow freely and abundantly.