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

Encyclopedia: Ad libitum

• worm fence
• worm fish
• worm gear
• worm genus
• worm lizard
• worm salamander
• worm snake
• worm wheel
• worm-eaten
• worm-shaped
• wormcast
• wormhole
• Wormian bone
• wormlike
• wormseed
• wormseed mustard
• wormwood
• wormwood oil
• wormwood sage
• wormy
• worn
• worn spot
• worn-out
• worried
• worriedly