Endeavour/ɪnˈdevər/ Definition 1 of 2Pro Tip 1/3Purposeful Action Used when the action has a clear goal or intention. Her latest endeavour was aimed at raising money for charity. Pro Tip 2/3Serious Effort Implies a significant amount of thought and effort was put in. Writing a novel is no small endeavour. Pro Tip 3/3Positive Connotation Often used to describe efforts with a positive or noble aim. Their endeavour to protect the environment won widespread support.