The Collaborative International Dictionary of English v.0.48:

Nice \Nice\ (n[imac]s), a. [Compar. Nicer (n[imac]"s[~e]r);
   superl. Nicest.] [OE., foolish, fr. OF. nice ignorant,
   fool, fr. L. nescius ignorant; ne not + scius knowing, scire
   to know. Perhaps influenced by E. nesh delicate, soft. See
   No, and Science.]
   1. Foolish; silly; simple; ignorant; also, weak; effeminate.
      [Obs.] --Gower.
      [1913 Webster]

            But say that we ben wise and nothing nice.
                                                  --Chaucer.
      [1913 Webster]

   2. Of trifling moment; unimportant; trivial. [Obs.]
      [1913 Webster]

            The letter was not nice, but full of charge
            Of dear import.                       --Shak.
      [1913 Webster]

   3. Overscrupulous or exacting; hard to please or satisfy;
      fastidious in small matters.
      [1913 Webster]

            Curious not knowing, not exact but nice. --Pope.
      [1913 Webster]

            And to taste
            Think not I shall be nice.            --Milton.
      [1913 Webster]

   4. Delicate; refined; dainty; pure.
      [1913 Webster]

            Dear love, continue nice and chaste.  --Donne.
      [1913 Webster]

            A nice and subtile happiness.         --Milton.
      [1913 Webster]

   5. Apprehending slight differences or delicate distinctions;
      distinguishing accurately or minutely; carefully
      discriminating; as, a nice taste or judgment. "Our author
      happy in a judge so nice." --Pope. "Nice verbal
      criticism." --Coleridge.
      [1913 Webster]

   6. Done or made with careful labor; suited to excite
      admiration on account of exactness; evidencing great
      skill; exact; fine; finished; as, nice proportions, nice
      workmanship, a nice application; exactly or fastidiously
      discriminated; requiring close discrimination; as, a nice
      point of law, a nice distinction in philosophy.
      [1913 Webster]

            The difference is too nice
            Where ends the virtue, or begins the vice. --Pope.
      [1913 Webster]

   7. Pleasing; agreeable; gratifying; delightful; good; as, a
      nice party; a nice excursion; a nice day; a nice sauce,
      etc. [Loosely & Colloquially]
      [1913 Webster]

   8. Pleasant; kind; as, a nice person.
      [PJC]

   9. Hence: Well-mannered; well-behaved; as, nice children.
      [PJC]

            He's making a list, checking it twice.
            Gonna find out who's naughty or nice
            Santa Claus is coming to town.        --Song.

   To make nice of, to be scrupulous about. [Obs.] --Shak.
      [1913 Webster]

   Syn: Dainty; delicate; exquisite; fine; accurate; exact;
        correct; precise; particular; pleasant; kind;
        scrupulous; punctilious; fastidious; squeamish; finical;
        effeminate; silly; well-mannered; well-behaved.
        [1913 Webster]

WordNet (r) 3.0 (2006):

nice
    adj 1: pleasant or pleasing or agreeable in nature or
           appearance; "what a nice fellow you are and we all
           thought you so nasty"- George Meredith; "nice manners";
           "a nice dress"; "a nice face"; "a nice day"; "had a nice
           time at the party"; "the corn and tomatoes are nice
           today" [ant: awful, nasty]
    2: socially or conventionally correct; refined or virtuous;
       "from a decent family"; "a nice girl" [syn: decent, nice]
    3: done with delicacy and skill; "a nice bit of craft"; "a job
       requiring nice measurements with a micrometer"; "a nice shot"
       [syn: nice, skillful]
    4: excessively fastidious and easily disgusted; "too nice about
       his food to take to camp cooking"; "so squeamish he would
       only touch the toilet handle with his elbow" [syn: dainty,
       nice, overnice, prissy, squeamish]
    5: exhibiting courtesy and politeness; "a nice gesture" [syn:
       courteous, gracious, nice]
    n 1: a city in southeastern France on the Mediterranean; the
         leading resort on the French Riviera

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

NICE

   The Nonprofit International Consortium for Eiffel.