1. done without being planned, organized, or rehearsed

1. without preparation or planning

1. a short piece of instrumental music, especially for piano, that is usually light in character
Usage: music

Examples

• She gave an impromptu speech at the wedding reception.
• The band played an impromptu concert in the park.
• He decided impromptu to visit his old friend.
• The teacher asked students to give impromptu presentations.
• They organized an impromptu picnic when the weather cleared up.
• Chopin’s Impromptu in A-flat major is a beautiful piece.
• The meeting turned into an impromptu brainstorming session.