Featherheaded is a term commonly used to describe a person who is perceived as being frivolous or lacking in intelligence. Some synonyms for featherheaded include scatterbrained, flighty, vapid, airheaded, and empty-headed. These terms all convey a similar lack of seriousness or depth of thought. Other synonyms for featherheaded include ditzy, insubstantial, trivial, and shallow. While the term featherheaded may be used in a somewhat derogatory manner, it is important to remember that everyone has different strengths and weaknesses, and we should strive to treat others with kindness and respect regardless of their perceived level of intelligence.