Boilingly is an adverb that describes something that is extremely hot or angry. It is an exceedingly strong term and is not used commonly in casual conversation. However, there are several synonyms for boilingly, such as scorching, seething, raging, fuming, heatedly, and boiling over. These words describe the same level of intensity as boilingly, with each having its own unique twist. They can be used when describing anything from a hot day to a heated argument. It is essential to choose the right word that accurately conveys the intended meaning and level of intensity while writing or speaking.