A "metallic tremor" is a unique sensation that can be difficult to describe accurately. However, there are several synonyms that effectively capture its essence. One alternative term is "quivering metal", which evokes the image of vibrating metal surfaces. Another synonym is "metallic shiver", which portrays the sensation as a slight, rhythmic shaking. A more intense variant could be referred to as a "metallic quake", emphasizing the strength and magnitude of the trembling. Equally suitable is the term "metallic vibration", effectively conveying the rapid oscillation experienced. Lastly, the phrase "metallic shudder" emphasizes the sudden, involuntary movement typically associated with a tremor. Overall, these synonyms aptly convey the concept of a metallic tremor while allowing for slight differences in intensity and connotation.