The term 'is furious' can be described by four different crossword solutions: rages (5 letters), SEETHES (7 letters), steams (6 letters), and FUMES (5 letters). All of these words describe a person who is extremely angry and has lost their temper. Rages implies that the person is out of control and is expressing their anger in a loud and violent manner. SEETHES suggests that the person is simmering with anger, and is likely to explode at any moment. Steams implies that the person is so angry that they are visibly shaking and their face is turning red. Finally, FUMES implies that the person is so angry that they are emitting an invisible cloud of anger.