একেবারেই না

Not inherently. It depends on your tone. It's a firm negation, but in many contexts (like refusing food), it's actually polite because it's clear.

Yes, it's acceptable in formal writing to show total negation, though 'সম্পূর্ণরূপে' (completely) is more academic.

'Ekdom-i na' is slightly more casual and common in urban areas like Kolkata. 'Ekebarei na' is more standard/neutral.

Not exactly. For 'never', use 'Kokhono-i na'. 'Ekebarei na' means 'not at all' in terms of quality or extent.

No, it can stand alone as a response to a question. Example: 'Are you tired?' 'Ekebarei na!'

Use 'Amar kache ekebarei taka nei.' Note the use of 'nei' instead of 'na'.

Yes, it is equally common and understood in both regions.

Yes, but be careful. It's better to say 'Ami ekebarei ekmot noi' (I don't agree at all) rather than just 'Ekebarei na!'

It's an emphatic particle. It's like adding 'very' or 'at all' to the word it attaches to.

In very casual speech, people might just say 'Ekebarei!' with a negative headshake, omitting the 'na'.

No, 'Ekebarei na' is strictly negative. For positive emphasis, use 'Ekebare' (e.g., 'Ekebare thik' - completely right).

Because using it correctly requires an understanding of emphasis, register, and the distinction between 'na' and 'nei'.

Yes. 'She ekebarei bhalo na' (He is not good at all).

'Ekebare thik' (Completely right) or 'Sompurnobhabe' (Completely).