Flightier, which refers to someone or something that is easily excitable or prone to sudden movements or changes, has a variety of synonyms that capture its essence. Alternatives for flightier include "fickle", describing a person or thing that frequently changes their mind or behavior; "erratic", highlighting someone or something that lacks consistency or predictability; "restless", illustrating a constant need for movement or change; "skittish", portraying nervousness or jumping at slight stimuli; and "whimsical", emphasizing a fanciful or capricious nature. Ultimately, these synonyms elucidate the concept of being flightier, whether it be characterized by volatility, restlessness, unpredictability, or impulsiveness.