The Collaborative International Dictionary of English v.0.48:

Obfirm \Ob*firm"\, Obfirmate \Ob*firm"ate\, v. t. [L.
   obfirmatus, p. p. of obfirmare to make steadfast. See Ob-,
   and Firm, v. t.]
   To make firm; to harden in resolution. [Obs.] --Bp. Hall.
   --Sheldon.
   [1913 Webster]