Source : Webster's Revised Unabridged Dictionary (1913)

Rude \Rude\, a. [Compar. {Ruder}; superl. {Rudest}.] [F., fr. L.
   rudis.]
   1. Characterized by roughness; umpolished; raw; lacking
      delicacy or refinement; coarse.

            Such gardening tools as art, yet rude, . . . had
            formed.                               --Milton.

   2. Hence, specifically:
      (a) Unformed by taste or skill; not nicely finished; not
          smoothed or polished; -- said especially of material
          things; as, rude workmanship. ``Rude was the cloth.''
          --Chaucer.

                Rude and unpolished stones.       --Bp.
                                                  Stillingfleet.

                The heaven-born child All meanly wrapt in the
                rude manger lies.                 --Milton.
      (b) Of untaught manners; unpolished; of low rank; uncivil;
          clownish; ignorant; raw; unskillful; -- said of
          persons, or of conduct, skill, and the like. ``Mine
          ancestors were rude.''

Source : WordNet®

rude
     adj 1: socially incorrect in behavior; "resentment flared at such
            an unmannered intrusion" [syn: {ill-mannered}, {unmannered},
             {unmannerly}]
     2: (of persons) lacking in refinement or grace [syn: {ill-bred},
         {bounderish}, {lowbred}, {underbred}, {yokelish}]
     3: lacking civility or good manners; "want nothing from you but
        to get away from your uncivil tongue"- Willa Cather [syn:
        {uncivil}] [ant: {civil}]
     4: (used especially of commodities) in the natural unprocessed
        condition; "natural yogurt"; "natural produce"; "raw
        wool"; "raw sugar"; "bales of rude cotton" [syn: {natural},
         {raw(a)}, {rude(a)}]
     5: belonging to an early stage of technical development;
        characterized by simplicity and (often) crudeness; "the
        crude weapons and rude agricultural implements of early
        man"; "primitive movies of the 1890s"; "primitive living
        conditions in the Appalachian mountains" [syn: {crude}, {primitive}]

Source : Free On-Line Dictionary of Computing

rude
     
        [WPI] 1. Badly written or functionally poor, e.g. a program
        that is very difficult to use because of gratuitously poor
        design decisions.  Opposite: {cuspy}.
     
        2. Anything that manipulates a shared resource without regard
        for its other users in such a way as to cause a (non-fatal)
        problem.  Examples: programs that change tty modes without
        resetting them on exit, or windowing programs that keep
        forcing themselves to the top of the window stack.  Compare
        {all-elbows}.
     
        [{Jargon File}]
     
        (1994-10-27)