Here are some synonyms for hackneyed:
* Clichéd
* Trite
* Banal
* Overworked
* Unoriginal
* Stale
* Worn-out
* Battered
Examples:
* "The movie's plot was full of hackneyed tropes, like the damsel in distress and the heroic male lead."
* "Her writing style was so hackneyed that it felt like I had read the same story a hundred times before."
* "He used a hackneyed expression to describe his feelings, which made his speech seem insincere."
In essence, something hackneyed lacks originality and has become predictable and boring due to overexposure.