English▸ adjective
(tackier, tackiest)
informal showing poor taste and quality: even in her faintly tacky costumes, she won our hearts.
– ORIGIN early 19th century : of unknown origin. Early use was as a noun denoting a horse of little value, later applied to a poor white in some Southern states of the US, hence ‘shabby, cheap, in bad taste’ (mid 19th century).