The antonym of the word 'Meager' is-

Correct answer: Plentiful.

• Meager (adjective)
- English Meaning: deficient in quality or quantity.
- Bangla Meaning: অপ্রচুর; অসমৃদ্ধ, দুর্বল।

• Plentiful (adjective)
- English meaning: If something is plentiful, there is a lot of it available.
- Bangla meaning: প্রচুর; পর্যাপ্ত; বহুল।

• Other options:
ক) Miserable
- English meaning: being in a pitiable state of distress or unhappiness.
- Bangla meaning: দুঃস্থ; দুর্গত; অতিষ্ঠ; দুর্বিষহ।

খ) Stingy
- English meaning: not generous or liberal: sparing or scant in using, giving, or spending.
- Bangla meaning: কৃপণস্বভাব; ব্যয়কুণ্ঠ।

গ) Scarce
- English meaning: deficient in quantity or number compared with the demand : not plentiful or abundant.
- Bangla meaning: অপ্রতুল; দুষ্প্রাপ্য; দুর্লভ।

Source:
1. Accessible Dictionary by Bangla Academy.
2. Merriam-Webster Dictionary.