undecidability

is something which disrupts a dichotomy (i.e. Like ghosts which disrupt the ideas of present/absent or alive/dead).

An undecidable, and there are many of them in deconstruction (eg. ghost, pharmakon, hymen, etc.), is something that cannot conform to either polarity of a dichotomy (eg. present/absent, cure/poison, and inside/outside in the above examples). For example, the figure of a ghost seems to neither present or absent, or alternatively it is both present and absent at the same time (SM). (net)

undecidability, n.Definitions

undecidability