Which word describes something that is overused and lacks freshness?

The term that best describes something that is overused and lacks freshness is "trite." When a word or expression is referred to as trite, it indicates that it has been used so frequently that it has lost its original impact or significance, becoming clichéd or mundane. This characteristic often applies to phrases, ideas, or themes in writing and conversation that no longer resonate with audiences due to their excessive repetition.

The other options do not convey this meaning. "Unprecedented" refers to something that has never happened before, which is the opposite of being overused. "Unheralded" describes something that is not widely recognized or celebrated, again unrelated to the concept of being overused. A "tirade" refers to a long, critical speech or outburst, which does not relate to freshness or overuse at all. Thus, "trite" is the most fitting choice for conveying the idea of something that has become stale or clichéd through excessive use.