Formal:
* আমি গম্ভীর (Ami gambhir) - This is the most literal translation and implies a sense of seriousness and solemnity.
* আমি মজা করছি না (Ami maja korchi na) - This means "I'm not joking" and emphasizes the seriousness of your statement.
Informal:
* আমি সিরিয়াস (Ami serious) - This is a direct translation of "I am serious" and is commonly used in everyday conversation.
* আমি মজা করছি না বলেছি (Ami maja korchi na bolechhi) - This means "I told you I'm not joking" and adds emphasis to your seriousness.
Stronger:
* আমি মৃত্যু সিরিয়াস (Ami mrityu serious) - This literally translates to "I'm dead serious" and conveys a strong sense of urgency and seriousness.
The best phrase to use will depend on the specific situation and the tone you want to communicate.