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• Correct Answer: Antagonist.

• Antagonist (noun)
English Meaning: One who contends with another, especially in combat; an adversary; an opponent.
Bangla Meaning: প্রতিদ্বন্দ্বী; বিরোধী ব্যক্তি; প্রতিপক্ষ।

Other Options:
• Vulnerable (adjective)
English Meaning: exposed to the possibility of being attacked or harmed, either physically or emotionally.
Bangla Meaning: ক্ষতিগ্রস্ত হতে পারে এমন; আক্রম্য; অরক্ষিত

• Agnostic (noun)
English Meaning: A person who believes that nothing is known or can be known of the existence or nature of God.
Bangla Meaning: জড়বস্তু ছাড়া অন্য কিছু বা ঈশ্বর সম্বন্ধে কিছুই জানা সম্ভব নয় বলে যে ব্যক্তি বিশ্বাস করে; অজ্ঞেয়বাদী।

• Atheist (noun)
English Meaning: A person who disbelieves or lacks belief in the existence of God or gods.
Bangla Meaning: নিরীশ্বরবাদ; অনীশ্বরবাদ; নাস্তিক্য।

Source: Merriam-Webster Dictionary, Accessible Dictionary, Cambridge Dictionary.