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◉ The synonym of 'Impervious' is - Impermeable.

• Impervious [adjective]:
English Meaning: Not able to be influenced, hurt, or damaged.
Bangla Meaning:
(১) (পদার্থ) অভেদ্য; অপ্রবেশ্য; অব্যাপ্য: Plastic raincoats are
impervious to water.
(২) (লাক্ষণিক) অবিচলিত; অনভিভূত; অভেদ্য: impervious to criticism/argument.

• Synonyms: Impenetrable (অভেদ্য; দুর্ভেদ্য), Unreceptive to (অনর্থক), Impermeable (দূর্গম, অভেদ্য), Tight (শক্ত)।
• Antonyms: Receptive to ( গ্রহণযোগ্য), Susceptible to ( সংবেদনশীল; বেদনক্ষম), Permeable (ভেদ্য), Weak (দূর্বলচিত্ত), Pervious (সহজে ভেদ করা যায় এমন)।

Other Forms:
- Imperviously (adverb) - Imperviousness (noun)
Example Sentence:
1. They seem impervious to everything, even poison.
2. The rainforest is impervious to all but the most dedicated explorers.

Other options,
Unaware - অপরিজ্ঞাত;
Sagacious - বিচক্ষণ।

Source: Live MCQ lecture.