Source : Webster's Revised Unabridged Dictionary (1913)

Deprecative \Dep"re*ca*tive\, a. [L. deprecativus: cf. F.
   d['e]pr['e]catif.]
   Serving to deprecate; deprecatory. -- {Dep"re*ca*tive*ly},
   adv.

Source : WordNet®

deprecatively
     adv : in a deprecative manner