Source : Webster's Revised Unabridged Dictionary (1913)

Dapper \Dap"per\, a. [OE. daper; prob. fr. D. dapper brave,
   valiant; akin to G. tapfer brave, OHG. taphar heavy, weighty,
   OSlav. dobr[u^] good, Russ. dobrui. Cf. {Deft}.]
   Little and active; spruce; trim; smart; neat in dress or
   appearance; lively.

         He wondered how so many provinces could be held in
         subjection by such a dapper little man.  --Milton.

         The dapper ditties that I wont devise.   --Spenser.

         Sharp-nosed, dapper steam yachts.        --Julian
                                                  Hawthorne.

Source : WordNet®

dapper
     adj : marked by smartness in dress and manners; "a dapper young
           man"; "a jaunty red hat" [syn: {dashing}, {jaunty}, {natty},
            {raffish}, {rakish}, {smart}, {spiffy}, {snappy}, {spruce}]