apophatic
adjective
ap·o·phat·ic ˌa-pə-ˈfa-tik 
: of or relating to apophasis (see apophasis sense 2) : involving the practice of describing something by stating which characteristics it does not have
an apophatic description
It was a reactive consciousness, embedded mainly in an apophatic discourse.
Amila Buturovic, Cultural Survival Quarterly, Summer 1995
Amila Buturovic, Cultural Survival Quarterly, Summer 1995 especially : of, relating to, or being negative theology
apophatic theology
the Christian apophatic tradition
The deepest truth in all things is numinous, these apophatic masters taught, beyond reason, beyond language. Tim Lilburn, Fiddlehead, January 1993
Tim Lilburn, Fiddlehead, January 1993 … a humility that recognizes that all theology has both eschatological and apophatic dimensions. Lawrence S. Cunningham, Commonweal, 5 June 2009
Lawrence S. Cunningham, Commonweal, 5 June 2009 We'll … move on to Thomas Aquinas, in whom we can see that God's best hope is apophatic silence. John Crace, The Guardian (London), 7 July 2009
John Crace, The Guardian (London), 7 July 2009 
Word History
Etymology
borrowed from Medieval Latin apophaticus "negative, negating," borrowed from Greek apophatikós, adjective derivative of apóphasis "denial"
First Known Use
1850, in the meaning defined above