Explanation:

- Meagre: This word means lacking in quantity or quality, scanty, or insufficient.

- Civilised: This refers to a society characterized by advanced social and cultural development. It's not relevant as an antonym for "meagre."

- Miserable: This signifies a state of great unhappiness or discomfort. It does not contrast directly with "meagre."

- Plentiful: Correct Answer: This means existing in large amounts or more than enough, and directly contrasts with "meagre."

- Sparse: This describes something that is thinly dispersed or scattered, which is quite similar to "meagre," rather than opposite.