Glibly

Glibly (adverb): said or done too easily, showing lack of thought as to what was being said

"He was drunk, but spoke loquaciously and glibly..." (Dostoyevsky, 13)



Neville Longbottom frequently spoke glibly and thus ended up in many a painfully awkward conversation.

Dostoyevsky, Fyodor. Crime and Punishment. Trans. Richard Pevear and Larissa Volokhonsky. New York: Alfred A. Knopf, 1993. Print.