Source : Webster's Revised Unabridged Dictionary (1913)

Unseason \Un*sea"son\, v. t. [1st pref. un- + season.]
   1. To make unseasoned; to deprive of seasoning.

   2. To strike unseasonably; to affect disagreeably or
      unfavorably. [Obs.]

            Why do I send this rustic madrigal, That may thy
            tuneful ear unseason quite?           --Spenser.