Source : Webster's Revised Unabridged Dictionary (1913)

Stably \Sta"bly\, adv.
   In a stable manner; firmly; fixedly; steadily; as, a
   government stably settled.

Source : WordNet®

stably
     adv 1: in a stable solid fixed manner; "the boulder was balanced
            stably at the edge of the canyon"
     2: in a stable unchanging manner; "the death rate in Russia has
        been stably high"