titter
verb (used without object)
to laugh in a restrained, self-conscious, or affected way, as from nervousness or in ill-suppressed amusement.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Instead of any other comment, during his wife's readings he merely rubbed his hands pleasantly, and murmured as long as he was not asleep, titteringly, "This confusion, this confusion."
From Felix Lanzberg's Expiation by Ossip Schubin