The term "overexcitable" refers to something or someone that is excessively stimulated, agitated, or excited. There are several synonyms for the word "overexcitable," which include "jittery," "hyperactive," "restless," "fidgety," "nervy," "anxious," "uptight," and "sensitive." These words can be used interchangeably depending on the context in which the word is being used. For instance, "jittery" could be used to describe someone who is anxious or nervous. "Hyperactive" could be used to describe someone who is overly energetic and cannot sit still. "Restless" could be used to describe someone who is unable to relax or keep still. All these synonyms can be used to convey the meaning of the term "overexcitable".