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• The antonym of Obtuse is Astute.

Obtuse:
English Meaning: annoyingly insensitive or slow to understand.
Bangla Meaning: বোকা।

How to use Obtuse in a sentence:
'The manager's obtuse response to the employee's concerns only served to escalate the conflict, as he failed to grasp the seriousness of the issue.'

Astute:
English Meaning: having or showing an ability to accurately assess situations or people and turn this to one's advantage;
Bangla Meaning: বিচক্ষণ; চতুর।

Meanings of the other options-

• Witless: foolish; stupid; নির্বোধ; বোকা।

• Imperceptive: lacking in perception or insight; বিচক্ষণতার অভাব।

• Stolid: calm, dependable, and showing little emotion or animation; অনুত্তেজিত; অবিচলিত।

সুতরাং, বোঝা যাচ্ছে, অপশনে উল্লিখিত শব্দগুলোর মধ্যে 'Astute' শব্দটি 'Obtuse' এর বিপরীত অর্থ প্রকাশ করছে।

Source:

1. merriam-webster.

2. Accessible Dictionary by Bangla Academy.