More formal:
* Circumlocution: A roundabout way of speaking, often to avoid a direct statement.
* Politeness: A way of being tactful and avoiding harshness.
* Diplomatic language: Language used to avoid causing offense or tension.
* Verbal camouflage: A way of disguising the true meaning of something.
More informal:
* Sugarcoating: Making something sound more pleasant than it really is.
* Soft-pedaling: Downplaying the severity of something.
* Mincing words: Speaking carefully and indirectly.
* Beating around the bush: Avoiding the main point.
The best alternative will depend on the specific situation and the desired tone.