Direct opposites:
* Hatch: If you're talking about hatching eggs, the opposite is hatching.
* Exterminate: If you're talking about killing bacteria or viruses, the opposite is exterminating or destroying them.
Other possibilities:
* Abandon: If you're talking about nurturing or developing something, the opposite could be abandoning it.
* Destroy: If you're talking about something developing or growing, the opposite could be destroying it.
* Suppress: If you're talking about encouraging something to grow or develop, the opposite could be suppressing it.
To determine the best opposite, you need to consider the specific context in which you're using the word "incubate."
