The Collaborative International Dictionary of English v.0.48:

Facile \Fac"ile\a. [L. facilis, prop., capable of being done or
   made, hence, facile, easy, fr. facere to make, do: cf. F.
   facile. Srr Fact, and cf. Faculty.]
   1. Easy to be done or performed: not difficult; performable
      or attainable with little labor.
      [1913 Webster]

            Order . . . will render the work facile and
            delightful.                           --Evelyn.
      [1913 Webster]

   2. Easy to be surmounted or removed; easily conquerable;
      readily mastered.
      [1913 Webster]

            The facile gates of hell too slightly barred.
                                                  --Milton.
      [1913 Webster]

   3. Easy of access or converse; mild; courteous; not haughty,
      austere, or distant; affable; complaisant.
      [1913 Webster]

            I meant she should be courteous, facile, sweet. --B.
                                                  Jonson.
      [1913 Webster]

   4. Easily persuaded to good or bad; yielding; ductile to a
      fault; pliant; flexible.
      [1913 Webster]

            Since Adam, and his facile consort Eve,
            Lost Paradise, deceived by me.        --Milton.
      [1913 Webster]

            This is treating Burns like a child, a person of so
            facile a disposition as not to be trusted without a
            keeper on the king's highway.         --Prof.
                                                  Wilson.
      [1913 Webster]

   5. Ready; quick; expert; as, he is facile in expedients; he
      wields a facile pen. -- Fac"ile*ly, adv. --
      Fac"ile*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

facile
    adj 1: arrived at without due care or effort; lacking depth;
           "too facile a solution for so complex a problem"
    2: performing adroitly and without effort; "a facile hand"
    3: expressing yourself readily, clearly, effectively; "able to
       dazzle with his facile tongue"; "silver speech" [syn:
       eloquent, facile, fluent, silver, silver-tongued,
       smooth-spoken]

The Free On-line Dictionary of Computing (19 January 2023):

Facile

    A concurrent extension of ML from ECRC.

   (http://ecrc.de/facile/facile_home.html).

   ["Facile: A Symmetric Integration of Concurrent and Functional
   Programming", A. Giacalone et al, Intl J Parallel Prog
   18(2):121-160, Apr 1989].

   (1994-12-01)