What describes a phrase or idea that is overused and lacks originality?

The term that describes a phrase or idea that is overused and lacks originality is "hackneyed." This word is often used to characterize expressions or concepts that have lost their impact due to excessive use. Hackneyed phrases can make writing and speech seem clichéd and unoriginal, diminishing the effectiveness of communication.

In contrast, "innovative" and "groundbreaking" refer to ideas or approaches that are new and original, representing significant advancements or creative thinking. "Original" also indicates freshness and uniqueness, neither of which aligns with the notion of being overused. Therefore, "hackneyed" is the most appropriate term to convey the concept of something that has become stale through repetition.