risible

1. Of or pertaining to laughter.
   • 1912, Arthur Quiller-Couch, Hocken and Hunken, ch. 20:

     A joke merely affected her with silent convulsive twitchings, as though the risible faculties struggled somewhere within her but could not bring the laugh to birth.

2. Provoking laughter; ludicrous.
   • 1822, Sir Walter Scott, Peveril of the Peak, ch. 34:

     “I hope you find nothing risible in my complaisance?” replied his companion.

3. (of a person) Easily laughing; prone to laughter.