This phrase means something is definitely 'X'. It means 'it is only X' or 'it is nothing but X'.
Noun + 以外のなにものでもないPrimary
This phrase means something is definitely 'X'. It means 'it is only X' or 'it is nothing but X'.
彼のその行為は、裏切り以外のなにものでもなかった。
That act of his was nothing other than betrayal.
この困難な状況は、我々にとっての試練以外のなにものでもない。
This difficult situation is, for us, nothing other than a trial.
彼が成功したのは幸運などではなく、彼の努力以外のなにものでもない。
The reason he succeeded was not luck or anything of the sort; it was nothing other than his own effort.
この美しい風景は、自然が作り出した芸術以外のなにものでもない。
This beautiful scenery is nothing other than a work of art created by nature.
彼が示したのは、純粋な好奇心以外のなにものでもないということだ。
What he demonstrated is the fact that it was nothing other than pure curiosity.
Both phrases mean 'it is only X'. But '〜以外のなにものでもない' shows strong feelings. It is more dramatic. '〜に他ならない' is also formal. But it is for facts or clear ideas. For example, calling something 'betrayal' fits the first phrase well.
Don't use this when you want to talk about a verb or a whole sentence. For example, you can't say "He is silent is nothing other than agreement." You need to say "The fact that he is silent is nothing other than agreement."
Use this when you want to say something is definitely true. It means there is no other way to see it. It is a very strong way to end a discussion. Do not use it in normal talks.
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