tastelessly showy; "a flash car"; "a flashy ring"; "garish colors"; "a gaudy costume"; "loud sport shirts"; "a meretricious yet stylish book"; "tawdry ornaments"
If something such as paint or glue is tacky, it is slightly sticky and not yet dry. Test to see if the finish is tacky, and if it is, leave it to harden. = sticky
disapproval If you describe something as tacky, you dislike it because it is cheap and badly made or vulgar. a woman in a fake leopard-skin coat and tacky red sunglasses