(something non-existent) nihilo, nulajo;
all or nothing - omno o nulo.
nothing new - nulo nova.
absolutely nothing - tote / absolute nulo.
that person is nothing to me - ta homo esas nulo por me (ne relatas me).
that is nothing - to ne importas.
nothing is more beautiful than - nulo esas plu bela kam.
as if nothing had happened - quale se nulo eventabus.
nothing more - nulo pluse.
say nothing - tacar.