Final answer:
The difficulty in defining the word 'quality' in relation to the quality of life is due to subjectivity and individual perspectives.
Step-by-step explanation:
When it comes to the quality of life, articulating a precise definition for the word 'quality' is difficult due to the subjectivity and individual perspectives involved. Quality of life can vary greatly from person to person, as it is influenced by factors such as health, education, human rights, crime and personal safety, and environmental quality. These factors are subjective and can be interpreted differently by each individual.