What is a synonym for the underlined word diminish?

Here are the answers to the questions:

1. What is a synonym for the underlined word diminish? c) Weaken (yellow)

2. What is a synonym for the underlined word vigilant? a) Cautious (orange)

3. What is a synonym for the underlined word feeble? c) Weak (pink)

4. What is a synonym for the underlined word immense? b) Enormous (gray)

5. What is an antonym for the underlined word dreary? c) Bright (blue)

6. What is an antonym for the underlined word unsteady? b) Reliable (brown)

7. What is an antonym for the underlined word coarse? c) Smooth (green)

8. What is an antonym for the underlined word blissful? a) Frustrating (yellow)