in "From Politics to Life:ridding anarchy of the the leftist millstone", as part of defining what a break from the Left would entail (the Left being political) Wolfi Landstreicher says:
"The rejection of a political perception of social struggle; a recognition that revolutionary struggle is not a program, but is rather the struggle for the individual and social reappropriation of the totality of life. As such it is inherently anti-political. In other words,it is opposed to any form of social organization — and any method of struggle — in which the decisions about how to live and struggle are separated from the execution of those decisions regardless of how democratic and participatory this separated decision-making process may be."
Guerre au Paradis says this about a nihilism that would be embraced by today's nihilists:"When the nihilists of the 19th century threw their bombs into crowds, they were acting from the expression of a pure negativity, from a radical and global refusal of society, anxiously awaiting the end times, the end of the world, of making a definite end to a life devoid of sense. There was something to destroy. More precisely: everything was to be destroyed. "
and Voline says:"But the true basis of “nihilism” was a sort of characteristic individualism. Risen, first, as a normal reaction against all that, especially in Russia, crush free and individual thought, its bearer, this individualism ended by renouncing, in the name of an absolute individual liberty, all the constraints, all the shackles, obligations and traditions imposed on individuals by the family, society, customs, mores, beliefs, etc... Complete emancipation of the individual, man or woman, from all that could attack its independence or the liberty of its thought: such was the fundamental idea of “nihilism.” It defended the sacred right of the individual to complete liberty, and the inviolable privacy of existence."
i see anti-political as a large category that includes nihilism as a sub-category.