The opposite is literally the opposing .
Nothingness, that something, or some Being manifests.
But such nothingness is the product of a linear attitude, in the context of the strictly pre-symbolic. The elements of the pre-symbolic is strictly based on presence/absence.
Presence/absence does not involve the ego-self, an idea, but only a proverbial manifestation of a relational posture: the nothingness of the self.
That nothingness means the absence of a relational sign, nothing else.
Dasein consists of the 'other’s manifestation toward , or away in signifying it’s relation.
It is a self cirscribed center of various significations.
The signifiers define it.
Complex signifiers are the contexts within which the ego develops.
The ego is not transcendent apart its contexts within which significance develops.
Nihilism is an absolute reduction to this attitude -posture, and modernly it may consist of a neutrality born out of ambivalence. ( between the reduction and the production of significance)
It is no mere coincidence that das signifies neutrality, a neutral contextual symbolism, that intentionally defines it’s self in opposition to the nothingness of the reduced existential phenomenon-of the. eye: . (Sartre’s concept) in its early manifestation.
Nihilism is the nominal opposite of the phenomenal.
A comment may be had here that it would be necessary to bring this toward a less abstract definition, but the best way is to point to the phenomenological reduction as the antithesis of the essential toward which it is reduced.
Existence does precede the essential, but the incorporation of it is inavoidable ex-post facto.
Unless, the reduction becomes aligned with a belief in god, as that, which came before any manifestation.
The rationalist position of neutrality is signified by the dialectical synthesis, and contraverts the material with the immaterial. (Kant Hegel) contrary to opinion, they are postural manifestations and they are not contrary. They actually complement each other, probably, but not sufficiently cyclically.
This is why I am a firm believer in that the holding of a nihilistic posture can adhere to higher contextual spheres, which include both.
The paradoxical nature of the relationship come out literally :
‘Heidegger uses the expression Dasein to refer to the experience of being that is peculiar to human beings. Thus it is a form of being that is aware of and must confront such issues as personhood, mortality and the dilemma or paradox of living in relationship with other humans while being ultimately alone with oneself.
Wikipedia › wiki › Dasein
Dasein’ - Wikipedia
In other words , it may be an intentional use of das ein & .da sein which combine in differing structural hierarchies to be defined in such a way, as to signal the circularity inherent.
Finally: the only support I could find for the above patadoxicality was the oriental connection :
'Some have argued for an origin of Dasein in Chinese philosophy and Japanese philosophy: according to Tomonobu Imamichi, Heidegger’s concept of Dasein was inspired—although Heidegger remained silent on this—by Okakura Kakuzo’s concept of das-in-der-Welt-sein (being-in-the-worldness, worldliness) expressed in The Book of Tea to describe Zhuangzi’s Taoist philosophy, which Imamichi’s teacher had offered to Heidegger in 1919, after having followed lessons with him the year before.[15] Parallel concepts are also found in Indian philosophy[16][17] ’
{ I think it was left unsaid for a reason, but that evades the central mystery of how transcendence is overcome by Jaspers, re.: the existential jump):
Yo proceed from Jaspers to Lacan, for it appears it is of a necessity here, because of Your particular block iambig, that the ‘existential junp’ can have no practical sense. that the objectives borne out of a transcendence don’t show a possible venue:
'Jacques Lacan turned in the 1950s to Heidegger’s Dasein for his characterisation of the psychoanalyst as being-for-death: (être-pour-la-mort).[20] Similarly, he saw the analysand as searching for authentic speech, as opposed to “the subject who loses his meaning in the objectifications of discourse…[which] will give him the wherewithal to forget his own existence and his own death”.
{this implies the very limitations of speech within the contextual narrative within which the Russel-Wittgenstein-Sassure analysis show boldly the lack of similitude, the unfilled spaces, between conceptual chains , rather then its opposing use of intentionally programmed criteria.}
In terms of criteria, the objective limit of conscious manifestation devolves back unto the presubjective Dasein, the original state if unintended consciousness In-It-Self. That self carries the world of possibility, but only at times when the spaces between are put on hold.(epoche)
The Buddhic connection becomes manifest here, as a matter of periodic criteria.
Anyway, the idea seems to manifest similarly as in the test of/ for the uncertainty principle: vis. the search for the connection of uncertain with the general principles. (Acin to Einstein’s need to connect the general with the special theory)
That it has not yet been achieved-automatically transforms the need unto the primordial solutions offered by the Vedas.