Rigorous (adjective): English Meaning - Careful to look at or consider every part of something to make certain it is correct or safe. Bangla Meaning - (১) কঠোর; প্রচণ্ড। (২) তীব্র: rigorous weather.
Other forms: Rigorously (adverb) - কঠোরভাবে; প্রচণ্ডভাবে।
Source: 1. Cambridge Dictionary. 2. Accessible Dictionary by Bangla Academy.