quixotic

1. ADJ If you describe someone's ideas or plans as quixotic, you mean that they are imaginative or hopeful but unrealistic. 不切實(shí)際的[正式]

He has always lived his life by a hopelessly quixotic code of honour. 他總是活在一種毫無希望、不切實(shí)際的榮譽(yù)法典里。