Find the root of the problem
As INC.com notes, the problem usually cannot be reduced to the fact the subordinate has simply decided to be lazy. In most cases, there will be another, deeper root cause. Sit down with the subordinate, talk to them, and get to the bottom of the problem. Find out exactly what is going on, why they are not performing as well as they should, then look for solutions to the cause, not just the symptoms.
Set clearer rules and expectations with the subordinate
Every employee is different. Some work independently, not wanting to be guided by anybody as they are able to find motivation within themselves. But other workers need clearer guidance and are much more productive when given clear instructions. If you find a subordinate falls more into the latter group, the solution may be to establish clearer expectations and to communicate very specific rules and requirements.
Find out what motivates the subordinate and try to offer it to them
Each person is an individual. Some people are motivated only by money, some by the meaningfulness of their work, others by career prospects or the opportunity to work independently. Each subordinate will have different needs. A manager needs to adapt the way of motivating each subordinate based on individual preferences. Find what best motivates people, and if it is at all within your capabilities, offer it to them.
Solve the problem immediately
Do not expect the problem to solve itself. If you see a subordinate is not performing as well as they should, that they lack motivation and are "lazy", so to speak, address the problem immediately. Failure to do so risks the problem later getting out of all proportion, thus making it all the more difficult to solve.
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