Blood-hot is an idiom that suggests extreme heat or passion. Synonyms for this term could include scorching, blazing, fiery, burning, searing, ardent, fervent, intense, passionate, and feverish. These words all paint a picture of something that is extremely hot or passionate. Depending on the context in which blood-hot is being used, there may be specific synonyms that are more appropriate. For example, if blood-hot is being used to describe anger or frustration, synonyms like boiling, infuriated, or enraged may be more fitting. Whatever the context, there are numerous synonyms that can help convey the intended meaning behind the phrase blood-hot.