Мне больше ничего не нужно.

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Breakdown of Мне больше ничего не нужно.

• не: not
• нужно: to need
• ничего: nothing

Questions & Answers about Мне больше ничего не нужно.

Why is мне used instead of я?

Because Russian usually expresses to need with an impersonal pattern:

кому? + нужно / надо + what

So the literal structure is closer to To me, nothing else is needed than to I need....

• мне = to me / for me in the dative case
• я would be the subject form I, which does not fit this pattern

So Я больше ничего не нужно is wrong, but Мне больше ничего не нужно is correct.

What does больше mean here?

Here больше means any more, any longer, or anything else, depending on context.

It does not just mean the simple comparative more.

So this sentence can mean things like:

• I don't need anything else
• I don't need anything more
• I don't need anything anymore

In negative sentences, больше very often has this any more / no longer sense.

Why are both ничего and не used? Isn't that a double negative?