Being dumbstruck refers to a state of speechlessness or an inability to express oneself due to extreme shock or surprise. Some antonyms for being dumbstruck are being articulate, eloquent, or loquacious. When one is fluent, articulate, or communicative, they are able to express themselves effectively and coherently. Other antonyms for being dumbstruck include being confident, assertive, or audacious. These traits represent having an attitude and personality that is bold, self-assured, and unafraid to express oneself. When one is not dumbstruck, they are able to communicate effectively, confidently, and assertively, making a strong impression on those they are communicating with.