Read the following passage carefully and answer the question. The Indians as a group are not cohesive. There is a lack of ‘coordination’ among individuals, groups, institutions and States. This lack…

Read the following passage carefully and answer the question.

The Indians as a group are not cohesive. There is a lack of ‘coordination’ among individuals, groups, institutions and States. This lack of ‘coordination’ may be traced to selfishness, lack of trust and the inability to find joy in working together as a team for a common goal. This leads to divisiveness, asking for criticism, with the result images are tarnished and the main purpose is defeated. This phenomenon is visible among the bureaucrats, the politicians, the intellectuals, the business community and the sports fraternity, all those who matter and who give a poor account of themselves as a group despite individual brilliance. This contrast in human behavior can perhaps be traced to age-old beliefs, religious tolerance, poverty and the diversity in day-to-day living conditions

Which word in the passage means 'to lose brightness or become dull'?