Risible \RIZ-uh-buhl\ adjective
1. Capable of laughing; disposed to laugh.
2. Exciting or provoking laughter; worthy of laughter; laughable; amusing.
3. Relating to, connected with, or used in laughter; as, "risible muscles."
Origin: Risible comes from Late Latin risibilis, from the past participle of Latin ridere, "to laugh, to laugh at." The noun is risibility.