The Collaborative International Dictionary of English v.0.48:

Alder-liefest \Al`der-lief"est\ ([add]l`d[~e]r*l[=e]f"[e^]st),
   a. [For allerliefest dearest of all. See Lief.]
   Most beloved. [Obs.] --Shak.
   [1913 Webster]