Directions: Choose the option that does not belong to the group.

'Lassitude' is state or feeling of being tired. Languor' is a lack of vitality and weakness as is enervation. 'Fatigue' is also physical and mental exhaustion. “Inertia' represents tendency to remain in a fixed condition without change. Thus it can be easily seen that 'Inertia' is quite different than other three terms, hence option (4) is correct answer.