1. Without prior preparation
   - extemporaneously, extempore

See also: extemporary

• burlap bag
• burled
• burlesque
• burliness
• Burlington
• burly
• Burma
• Burma padauk
• Burmannia
• Burmanniaceae
• Burmeisteria
• Burmeisteria retusa
• Burmese
• Burmese cat
• Burmese rosewood
• Burmese-Yi
• burn
• burn bag
• burn center
• burn centre
• burn down
• burn mark
• burn off
• burn out
• burn plant