frank \frank\ fra^ngk, a. compar. franker
   fra^ngk"~er; superl. frankest. f. franc free,
   frank, l. francus a frank, fr. ohg. franko the name of a
   germanic people on the rhine, who afterward founded the
   french monarchy; cf. as. franca javelin, icel. frakka. cf.
   franc, french, a., franchise, n.
   1. unbounded by restrictions, limitations, etc.; free. r.
      "it is of frank gift." --spenser.
      1913 webster

   2. free in uttering one's real sentiments; not reserved;
      using no disguise; candid; ingenuous; as, a frank nature,
      conversation, manner, etc.
      1913 webster

   3. liberal; generous; profuse. obs.
      1913 webster

            frank of civilities that cost them nothing.
                                                  --l'estrange.
      1913 webster

   4. unrestrained; loose; licentious; -- used in a bad sense.
      --spenser.

   syn: ingenuous; candid; artless; plain; open; unreserved;
        undisguised; sincere. see candid, ingenuous.
        1913 webster
see also:
franker frankest franc french franchise candid 
ingenuous