The Collaborative International Dictionary of English v.0.48:

Comminatory \Com*min"a*to"ry\, a. [Cf. F. comminatoire.]
   Threatening or denouncing punishment; as, comminatory terms.
   --B. Jonson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

comminatory
    adj 1: containing warning of punishment [syn: comminatory,
           denunciative, denunciatory]