different between libidinist vs libidinous

English

From stem of Latin libidinor (“I indulge”) +? -ist

libidinist (plural libidinists)

(rare) A lecher or oversexed person.
- 2011, Jeanne McElvaney, Old Maggie’s Spirit Whispers (page 107)
  With one day flowing into another as the short, cold days seemed to hold Paddington Cove in the grip of yearning for spring, Old Maggie thought often of the village's libidinist. Jem's lewd ways had gone unchecked for so many years […]

From Middle English libidinous, borrowed from Latin lib?din?sus.

libidinous (comparative more libidinous, superlative most libidinous)

(having lustful desires): hot to trot, lascivious, lewd, licentious, lustful, wanton; See also Thesaurus:randy

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