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◉ The meaning of the word 'Surreptitious' is - Kept secret, especially because it would not be approved of.

Surreptitious (adjective):
English Meaning - Done secretly, without anyone seeing or knowing.
Bangla Meaning - (কাজ) গুপ্তভাবে কৃত; চোরাগোপ্তা।

Other forms:
Surreptitiously (adverb) - চুপিচুপি; লুকিয়ে লুকিয়ে।

Example Sentences:
- She seemed to be listening to what I was saying, but I couldn't help noticing her surreptitious glances at the clock.
- All of this adds further energy to the portrait of surreptitious scheming.

Other options,
খ) Done openly with full disclosure to all parties involved - সকলকে জানিয়ে খোলাখুলিভাবে কার্য সম্পাদন করা।
গ) Performed with great precision and attention to detail - নির্ভুলতার সহিত সম্পাদন করা।
ঘ) Carried out with unnecessary force or intensity - অপ্রয়োজনীয় বল বা উগ্রতা প্রয়োহ না করে সম্পন্ন করা।

Source:
1. Cambridge Dictionary.
2. Accessible Dictionary by Bangla Academy.