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

Encyclopedia: Ad libitum

• labor pain
• labor pains
• Labor Party
• labor pool
• labor resources
• Labor Secretary
• labor union
• labor-intensive
• laboratory
• laboratory bench
• laboratory coat
• labored
• laborer
• laboring
• laborious
• laboriously
• laboriousness
• laborsaving
• labour
• labour agreement
• labour camp
• labour coach
• labour contract
• Labour Day
• labour force