Final answer:
Walter's attitude toward life in A Raisin in the Sun is unrealistic due to his unrealistic aspirations, materialistic focus, and dependence on external validation.
Step-by-step explanation:
In A Raisin in the Sun, Walter's attitude toward life is unrealistic in several ways. Firstly, he has unrealistic aspirations of becoming rich through a business venture, despite having no experience or knowledge in that field. Additionally, he is overly focused on material wealth and believes that money is the solution to all his problems. Finally, Walter's attitude toward life is unrealistic in that he constantly seeks validation from others and believes that his self-worth is determined by the approval of others.