Definitions

1. verb

to make someone or something less ready or less well-prepared for something

“The hurricane warning made the authorities unprepare the public for the disaster.”

2. verb

to fail to prepare someone or something for something

“The new management unprepared the company for the financial crisis.”

3. verb

to make something less suitable or less acceptable for a particular purpose

“The new design unprepared the old building for modern use.”