The topos of ineffability

The topos of ineffability (German: Unsagbarkeitstopos) is a rhetorical and philosophical motif referring to claims about the inadequacy of language to fully express certain experiences, objects, or forms of knowledge. The concept is used as a retrospective analytical category in the study of rhetoric, literature, theology, and philosophy, rather than as a self-designation employed by historical authors.

The motif has been discussed in Western rhetorical and philosophical traditions from antiquity to modern theory, particularly in relation to metaphysical, aesthetic, and religious discourse.