1. Without advance preparation
   - ad lib, spontaneously, impromptu

Encyclopedia: Ad libitum

• jelled
• jellied
• jellify
• jello
• jelly
• jelly baby
• jelly bean
• jelly doughnut
• jelly egg
• jelly fungus
• Jelly Roll Morton
• jellyfish
• jellyleaf
• jellylike
• jellyroll
• JEM
• Jemaah Islamiyah
• jemmy
• Jena
• Jenghiz Khan
• Jenner
• jennet
• jenny
• jenny ass
• Jenny Lind