The term 'be wasteful' can be summarized by two crossword solutions: EXTRAVAGANT (11 letters) and ADO (3 letters). EXTRAVAGANT means to be excessively or needlessly lavish in spending money, time, or resources. ADO means to be busy with activity or fuss. Together, these two words suggest that to be wasteful is to be overly busy or lavish with resources, which can lead to a lack of efficiency and an unnecessary expenditure of resources.