Source : Webster's Revised Unabridged Dictionary (1913)

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

         Thy sometimes brother's wife.            --Shak.

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

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

   2. At times; at intervals; now and then;occasionally.

            It is good that we sometimes be contradicted. --Jer.
                                                  Taylor.

   {Sometimes . . . sometimes}, at certain times . . . at
      certain other times; as, sometimes he is earnest,
      sometimes he is frivolous.

Source : WordNet®

sometimes
     adv : 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"