Choose the correct synonym for the word IMPROMPTU from the options given below:

Option 1: Scripted -> means following a written plan or text, which is the opposite of impromptu.

Option 2: Prepared -> means made ready in advance, which contradicts the spontaneous nature of impromptu.

Option 3: Unrehearsed -> means done without practice or preparation, which perfectly matches the meaning of impromptu.

Option 4: Unprofessional -> refers to lacking professional standards, which is unrelated to the concept of being spontaneous.

Hence, Option 3: Unrehearsed -> IMPROMPTU means something done spontaneously without prior planning or rehearsal, making "unrehearsed" the perfect synonym -> correct