Explanation:

- The given word is INNATE, which refers to qualities or characteristics that are inborn or naturally present from birth.

- Option 1: Basic - This means fundamental or essential. It is not an antonym of innate, as both can be inherent.

- Option 2: Simple - This means easy or uncomplicated. It does not directly oppose the idea of being innate.

- Option 3: Unassuming - This means modest or not pretentious. It doesn’t relate directly to the concept of being innate.

- Option 4: Acquired - This means skills or characteristics gained through experience or external influence, not naturally present. It directly opposes innate.

- Correct Answer: Option 4 - Acquired