Risibility :: Risibility (n.) The quality of being risible; as, risibility is peculiar to the human species..
Risible :: Risible (a.) Having the faculty or power of laughing; disposed to laugh.
Risible :: Risible (a.) Exciting laughter; worthy to be laughed at; amusing.
Risible :: Risible (a.) Used in, or expressing, laughter; as, risible muscles..