The Collaborative International Dictionary of English v.0.48:

Sometimes \Some"times`\, adv. [Sometime + adverbial ending -s,
   as in -wards.]
   1. Formerly; sometime. [Obs.]
      [1913 Webster]

            That fair and warlike form
            In which the majesty of buried Denmark
            Did sometimes march.                  --Shak.
      [1913 Webster]

   2. At times; at intervals; not always; now and then;
      occasionally.
      [1913 Webster]

            It is good that we sometimes be contradicted. --Jer.
                                                  Taylor.
      [1913 Webster]

   Sometimes . . . sometimes, at certain times . . . at
      certain other times; as, sometimes he is earnest,
      sometimes he is frivolous.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sometimes \Some"times`\, a.
   Former; sometime. [Obs.]
   [1913 Webster]

         Thy sometimes brother's wife.            --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sometimes
    adv 1: on certain occasions or in certain cases but not always;
           "sometimes she wished she were back in England";
           "sometimes her photography is breathtaking"; "sometimes
           they come for a month; at other times for six months"