Choose the most appropriate ANTONYM of the given word.

IMPROMPTU

Deliberate 

The most appropriate antonym of the word impromptu is deliberate.

• Impromptu means "done or said without preparation or forethought."
• Deliberate means "done or considered with care and attention."

The other words do not have the same meaning as deliberate.

• Barricade means "a barrier or obstruction, especially one used to block a road or entrance."
• Summit means "the highest point of a mountain or hill."
• Desolate means "having no inhabitants or signs of life."