gabbiest is gabby's Superlative

gabby

US [ˈɡæbi]
UK ['ɡæbi]
  • adj.〈口〉爱说话的
  • Web饶舌的;盖比;加比
Comparative Degree:gabbier  Superlative:gabbiest  
adj.
1.
〈口〉爱说话的,多嘴的