Source : Webster's Revised Unabridged Dictionary (1913)

Tacky \Tack"y\, a. [Etymol. uncert.]
   Dowdy, shabby, or neglected in appearance; unkempt. [Local,
   U. S.]

Tacky \Tack"y\, n. [Written also {tackey}.]
   An ill-conditioned, ill-fed, or neglected horse; also, a
   person in a like condition. [Southern U. S.]

Tacky \Tack"y\, a. [Cf. {Techy}, {Tack} a spot.]
   Sticky; adhesive; raw; -- said of paint, varnish, etc., when
   not well dried. [U. S.]

Source : WordNet®

tacky
     adj 1: (of a glutinous liquid such as paint) not completely dried
            and slightly sticky to the touch; "tacky varnish"
     2: tastelessly showy; "a flash car"; "a flashy ring"; "garish
        colors"; "a gaudy costume"; "loud sport shirts"; "a
        meretricious yet stylish book"; "tawdry ornaments" [syn: {brassy},
         {cheap}, {flash}, {flashy}, {garish}, {gaudy}, {gimcrack},
         {loud}, {meretricious}, {tatty}, {tawdry}, {trashy}]
     [also: {tackiest}, {tackier}]