Unlike a social butterfly (3)

I believe the answer is:

shy

(Other definitions for shy that I've seen before include "Coy" , "Timid; throw quickly" , "Retiring; fling" , "Reticent" , "Bashful or timid" .)

I've seen this clue in the Universal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.