incessant
Adjective
This word carries a heavy burden of irritation and exhaustion. While similar to continuous or constant, incessant specifically implies that the repetition is unwelcome or oppressive, creating a feeling of being trapped by a sound or action that refuses to stop. It is typically used in negative contexts to describe sensory intrusions, such as noise, rain, or complaining. It suggests a psychological toll on the listener or observer, turning a simple repetition into a source of mental stress.