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• Abstruse (Adjective):
- English Meaning: Not known about by many people and difficult to understand.
- Bangla Meaning: গূঢ়, দুর্বোধ্য; প্রগাঢ়।

• Synonyms:
- Complex (জটিল),
- Recondite (নিগূঢ়),
- Complicated (দুর্বোধ্য)।

• Antonyms:
- Straightforward (সহজবোধ্য),
- Simple (সাদামাটা),
- Familiar (চেনাজানা)।

• উল্লিখিত অপশনগুলো,
- Familiar - চেনাজানা;
- Simple - অবিমিশ্র; অবিভক্ত;
- Obscure - অন্ধকারময়; গুপ্ত; অস্পষ্ট;
- Obvious - স্পষ্টত প্রতীয়মান; পরিষ্কার; সোজা।

• সুতরাং, অপশন বিবেচনা করে দেখা যায় যে, The synonym of the word "Abstruse" is - Obscure.

• Example sentence:
- His explanation became more abstruse as he continued speaking.
- The professor’s theory was so abstruse that few students understood it.

Source: Merriam & Webster Dictionary, Oxford Dictionary, Accessible Dictionary.