An ambitious project would be something that is hard to achieve or complete. One example might be like trying to complete a project a week before its do, a project you were assigned a month ago. That would be ambitious, difficult, hard, but not impossible.
An ambitious project is the one in which there are high expectations to fulfill; therefore, there can be many obstacles during the development of the project. An example of an ambitious project can be to build a free shelter for homeless people in every city of the United States only by asking the citizens to provide a voluntary fee. It may be difficult and ambitious to gather all the money needed to launch the project, but it is not impossible.
