Longman Dictionary of Contemporary English homepage

Sense: 1-2
Date: 1800-1900
Origin: tacky 'horse in poor condition' (1800-1900).
Sense: 3
Date: 1700-1800
Origin: TACK1

tacky

adjective
     
tack‧y
1 if something is tacky, it looks cheap or badly made, and shows poor taste:
tacky ornaments
2 especially American English showing that you do not have good judgment about what is socially acceptable:
It's kind of tacky to give her a present that someone else gave you.
3 slightly sticky:
The paint's still slightly tacky.
tackily adverb
tackiness noun [uncountable]

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