Plained is a lesser-known word used to describe the act of complaining or expressing dissatisfaction. While it is a useful word, it might not be the most widely used term in everyday language. Therefore, it is valuable to have a variety of synonyms to use instead. Some of the most common synonyms for "plained" include gripe, grumble, whine, moan, kvetch, and groan. These words convey a similar meaning and can be used interchangeably to describe someone who is complaining or expressing discontentment. Using these synonyms can help to add variety and depth to your language and make your writing or speaking more engaging.