UPSC CDS 1 2020 English Paper

The most appropriate antonym of the given word is ‘Activity’. Activity means the condition in which things are happening or being done.
Meaning of the other words are:
Sluggishness means slow-moving or inactiveness.
Indolence means avoidance of activity or exertion; laziness.
Torpor means a state of physical or mental inactivity; lethargy.