inertia

1. (physics, uncountable or countable) The property of a body that resists any change to its uniform motion; equivalent to its mass.countableuncountable

2. (figuratively) In a person, unwillingness to take action.Examples: "Men […] have immense irresolution and inertia."; "Not all the surviving veteran chiefs would actually fight. Some remained nominally in the resistance but in practice delayed at their bases, pretexting a lack of ammunition for their uncertain inertia."; "City had been woeful, their anger at their own inertia summed up when Samir Nasri received a booking for dissent, and they did not have a shot on target until the 66th minute."Synonyms: idleness, laziness, sloth, slothfulnesscountablefigurativelyuncountable

3. (medicine) Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased.countableuncountable