"benign situation" is correct and usable in written English.
You can use it to describe a situation that is not dangerous or harmful, or one that is likely to remain relatively unchanged. For example, "The stock market's rise in value is a benign situation for investors."
From what I've heard, it's a pretty benign situation".
"Then they encourage techniques which exacerbate the problem in a relatively benign situation.
10.29am: Dannatt says a relatively benign situation in 2003 began to become more difficult in 2004, and became very difficult from the summer of 2005 in Iraq.
There's still plenty of global warming and centuries of coastal retreats in the pipeline, so this is hardly a "benign" situation, as some have cast it.
They aired their complaints with police leaders at a public meeting Wednesday night, worried that what was once a fairly benign situation has turned increasingly dangerous.
To insist that all this be done within a year, entailing huge savings and cuts that will make a relatively benign situation worse, represents a triumph of dogma over pragmatism.
Their viewpoints are always glass half empty, and they can inject fear and concern into even the most benign situations.
Interpretation bias might explain why anxious children so readily evaluate fairly benign situations as dangerous.
You can try this at perfectly benign situations, such as when people are meeting for the first time, when someone pushes a button on an elevator, or when a couple is hugging.
Several researchers have reported a similar tendency among children with conduct problems to misperceive benign social situations as hostile [ 10- 12].
It required a deal of philosophical inventiveness to render this situation benign.
