He was silent and rather awkward, but sometimes, when he was alone with any one, he became talkative and effusive, and would laugh at anything or nothing.
"How can I thank you, Kuzma Kuzmitch?" cried Mitya effusively.
Mitya spoke much and quickly, nervously and effusively, as though he positively took his listeners to be his best friends.
Writing to Fyodor Pavlovitch, and discerning at once that he could extract nothing from him for his children’s education (though the latter never directly refused but only procrastinated as he always did in such cases, and was, indeed, at times effusively sentimental), Yefim Petrovitch took a personal interest in the orphans.