Twitchingly, a word that refers to sudden, involuntary movements, can be replaced with a number of other synonyms that convey similar meanings. Some of the commonly used synonyms for twitchingly are jerking, twitching, spasming, convulsing, quivering, and shuddering. These words describe the sudden and often uncontrolled movement of a body part or the entire body. Each of these synonyms can be used in different scenarios, depending on the context. For instance, spasming and convulsing are often used to describe more extreme or severe movements, while twitching and quivering are often associated with smaller, less noticeable movements. Overall, these synonyms provide a range of options for describing involuntary movements and can be used to add depth and specificity to writing.