Lightheadedly is a word that refers to a state of being dizzy or giddy. There are several synonyms for lightheadedly, including vertiginously, dizzily, woozily, and unsteadily. Those words all describe a feeling that things are spinning or moving around, often causing a sense of disorientation or imbalance. Other synonyms for lightheadedly include giddily, frivolously, and superficially, which all suggest a lack of seriousness or depth. When used in a medical context, synonyms for lightheadedly might include faintly, weakly, or lethargically, which suggest a lack of energy or stamina. Choosing the right synonym for lightheadedly will depend on the context in which it is used and the precise meaning that the writer is trying to convey.