The Collaborative International Dictionary of English v.0.48:
Lusty \Lust"y\, a. [Compar. Lustier; superl. Lustiest.]
[From Lust. See Lust, and cf. Luscious.]
1. Exhibiting lust or vigor; stout; strong; vigorous; robust;
healthful; able of body.
Neither would their old men, so many as were yet
vigorous and lusty, be left at home. --Milton.
2. Beautiful; handsome; pleasant. [Obs.] --Spenser.
3. Of large size; big. [Obs.] "Three lusty vessels."
--Evelyn. Hence, sometimes, pregnant. [Obs. or Prov.]
4. Lustful; lascivious. [Obs.] --Milton.