Source : Webster's Revised Unabridged Dictionary (1913)

Self-evident \Self`-ev"i*dent\, a.
   Evident without proof or reasoning; producing certainty or
   conviction upon a bare presentation to the mind; as, a
   self-evident proposition or truth. -- {Self`-ev"i*dent*ly},
   adv.

Source : WordNet®

self-evidently
     adv : in a self-evident manner