1. (

• improvise ,
• improvize ,
• ad-lib ,
• extemporize ,
• extemporise

) perform without preparation; "he extemporized a speech at the wedding" ;

2. (

• improvise ,
• extemporize

) manage in a makeshift way; do with whatever is at hand; "after the hurricane destroyed our house, we had to improvise for weeks" ;