An unambitious person does not have a strong wish to be successful, powerful, or rich.

She plays a competent, attractive young woman stuck with a slovenly and unambitious young man. 她饰演一个能干、有魅力的年轻女子，却跟一个邋遢、不思进取的小伙子纠缠不清。

He left school at 16, not because he was unambitious, but because he wanted to get on with his working life. 他16岁就离开了学校，不是因为没有上进心，而是因为想继续工作。

An unambitious idea or plan does not need much skill or effort to be achieved or to be successful.

The initial idea for the festival was something quite small and unambitious. 这个活动最初的想法只是一些相当小的、没有雄心的东西。

He called the current proposals "very lazy and unambitious". 他称目前的建议“非常懒惰，毫无雄心”。