Losing interest means your attention, curiosity, or enthusiasm for something is fading. It suggests disengaging, getting bored, or shifting focus due to time, effort, or unmet expectations.
I was losing interest in politics, when the repeal of the Missouri Compromise aroused me again. What I have done since then is pretty well known. Abraham Lincoln
The United States was losing interest in preserving European security, but at the same time it was hostile to European aspirations to take on the task themselves. Europeans complained about American perfidy, and Americans complained about European weakness and ingratitude. Robert Kagan
The principle element in a performance is risk, and if you're losing interest then by scaring yourself to death the audience will feel it and boy it'll wake them up. Leo Kottke
People under the influence of cults is similar to that we observe in addicts. Typical behaviour for both includes draining bank accounts, neglecting children, destroying relations with family and losing interest in anything except the drug or cult. Keith Henson