From The Collaborative International Dictionary of English v.0.48:
Tacky \Tack"y\, a. [Cf. Techy, Tack a spot.]
Sticky; somewhat adhesive;; -- said of paint, varnish, etc.,
when not well dried. [U. S.]
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Tacky \Tack"y\, a. [Etymol. uncert.]
1. Dowdy, shabby, or neglected in appearance; unkempt.
[Local, U. S.]
[Webster 1913 Suppl.]
2. In poor taste; appearing cheap; gaudy; unstylish. Broadly
used to describe objects whose style is disapproved of by
the speaker.
[PJC]
3. Tactless; in poor taste; -- used to describe behavior.
[PJC]
From The Collaborative International Dictionary of English v.0.48:
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.]
[Webster 1913 Suppl.]