The connotation that could best be determined for the boldfaced word i.e. "furious" would be 'angry' as the word furious implies the extreme anger or full of violence or intensity. The use of this word here, illustrates the intensity of the situation that filled the author with rage. Thus, the word in bold or bracketed letter exemplifies the enraged and fierce reaction of the Peter after witnessing, perhaps due to the speaker lying on his bed.
