Reference reading
Laziness
Leaving worthwhile effort to someone else when a reasonable share is within reach.
Habitual avoidance of worthwhile effort that one has a reasonable capacity and responsibility to undertake.
Imagine this: A housemate spends considerable energy balancing a teaspoon on a remote control rather than take their agreed turn clearing an otherwise manageable breakfast table.

How the pattern works
The person is not short of activity. The ingenuity being spent on the remote would be unnecessary if the teaspoon were simply taken to the kitchen. Laziness, used here as the familiar display name for Sloth, can be energetic when the energy serves avoidance.
The important questions are whether the effort is worthwhile, reasonably within capacity and fairly theirs to undertake. Without those conditions, a demand for effort can be a demand for someone else’s convenience. With them, repeated evasion leaves the task intact and its burden ready to pass to another person.
What it costs a shared life
One unwashed cup may be trivial. An arrangement in which the same person routinely waits out their share is less trivial. Others must decide whether to complete the work, remind them again or let the shared space become unusable. Avoidance acquires a hidden subsidy in someone else’s effort.
A distinction worth keeping
Rest, disability, depletion and refusal of an unjust demand are not Sloth. Appearance of busyness proves neither effort nor avoidance. Negligence concerns due care; Sloth concerns evading worthwhile effort. A workable response may reduce or reassign a task rather than demand that an overloaded person push harder.
What a useful response can change
Identify a fair, specific share instead of attaching a character label to the person. Capacity, paid and unpaid work, and changing circumstances belong in that discussion.
Where the task is reasonable, attend to its actual beginning: take the cup through rather than invent a new system that postpones it. A small completion can matter more than elaborate preparation.
Change an arrangement that repeatedly fails. Asking for help or sharing effort differently can be responsible; quietly waiting for another person to do everything is a different choice.
Questions for reflection
- What effort am I spending to avoid the agreed effort?
- Is this allocation fair and feasible for the people carrying it?
Other perspectives
The longer it is delayed and kept sacred from the vulgar gaze, the more it swells into imaginary consequence; the labour and care required for a work of this kind being immense:—and then there are no faults in an unexecuted translation.
William Hazlitt · Table Talk, in Collected Works, volume VI · Read the source
Hazlitt jokes about the perfect work that remains unexecuted. His observation fits the teaspoon contrivance: preparation and ingenuity can protect an undertaking from the ordinary test of actually beginning it.
It is true that the amusement of some is the day's work of others; but the pleasure, not to say the useful recreation, of many, is worth the labour of a few, provided the occupation is freely chosen, and can be freely resigned.
John Stuart Mill · On Liberty · Read the source
Mill makes freely chosen and freely resignable work a condition in his example. That qualification matters here: someone’s refusal of an imposed or unfair burden cannot simply be relabeled Laziness.