Source : Webster's Revised Unabridged Dictionary (1913)

Instimulate \In*stim"u*late\, v. t. [Pref. in- not + stimulate.]
   Not to stimulate; to soothe; to quiet. [Obs.] --Cheyne.

Instimulate \In*stim"u*late\, v. t. [L. instimulatus, p. p.
   instimulare to stimulate. See 1st {In-}, and {Stimulate}.]
   To stimulate; to excite. [Obs.] --Cockerman.