What is the antonym of "sincere"?

Correct Answer: Deceitful.

Sincere
- Bangla Meaning: আন্তরিক; অকৃত্রিম।
- English Meaning: free of dissimulation: honest.

গ) Deceitful
- Bangla Meaning: প্রতারণার উদ্দেশ্যে ব্যবহৃত; প্রতারণাপূর্ণ; কপটতাপূর্ণ; কপট।
- English Meaning: behaving in a dishonest way by telling lies and making people believe things that are not true.

Other options:
ক) Honest
- Bangla Meaning: সত্যবাদী; সতাবৃত্ত; নিষ্কপট।
- English Meaning: free from fraud or deception.

খ) Genuine
- Bangla Meaning: প্রকৃত; খাঁটি; অকৃত্রিম।
- English Meaning: actually having the reputed or apparent qualities or character.

ঘ) Truthful
- Bangla Meaning: সত্যতা; যথার্থতা।
- English Meaning: telling or disposed to tell the truth.

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