General terms:
* Banality: This implies something has become commonplace and uninteresting.
* Mundane: This describes something ordinary and lacking excitement.
* Dullness: This refers to a lack of interest or excitement.
* Stale: This implies something has lost its freshness and become boring.
* Trite: This describes something overused and lacking originality.
More specific terms:
* Desensitization: This describes a loss of responsiveness to stimuli due to repeated exposure.
* Habituation: This refers to a decrease in response to a stimulus after repeated exposure.
* Saturation: This implies an overabundance of something, leading to a loss of value.
* Fatigue: This describes a feeling of weariness or exhaustion, often related to repeated exposure.
* Apathy: This refers to a lack of interest or enthusiasm, which can be caused by a loss of novelty.
Figurative terms:
* Worn out: This implies something has been used so much that it has lost its appeal.
* Lost its luster: This describes something that has become dull and uninteresting.
* Faded: This implies something has lost its brightness and vibrancy.
The best word to use will depend on the specific situation and the meaning you want to convey.