The Collaborative International Dictionary of English v.0.48:

deconstructionist \de`con*struc"tion*ist\
   (d[-e]`k[u^]n*str[u^]k"sh[u^]n*[i^]st), adj.
   Of or pertaining to deconstruction or deconstructionism; as,
   deconstructionist criticism.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

deconstructionist
    adj 1: of or concerned with the philosophical theory of
           literature known as deconstructionism; "deconstructionist
           criticism"