effusiveness n a friendly open trait of a talkative person Usage(s) He greets his host with Arabian effusiveness, a bear hug and three loud kisses on the cheeks. Cavett lacks Frost's effusiveness and Carson's one-man showmanship; his fans turn him on because he and his guests tend to be the most interesting. But others, like Yossi Beilin from the leftist Meretz Party, were dismayed by Obama's effusiveness. Synonym(s) expansiveness expansivity