Giddy-witted is a term that refers to someone who is foolish, silly, or lacking in common sense. There are several synonyms for this term, which can be used to describe such a person. Some of the common synonyms for giddy-witted include frivolous, flighty, scatterbrained, ditzy, dizzy, and silly. These terms can be used interchangeably to describe someone who is not serious or practical in their behavior or decision-making. Additionally, the term giddy-witted can also be replaced with words like impractical, thoughtless, foolish, inconsiderate, and reckless when describing someone's actions or decisions. Overall, the synonyms for giddy-witted convey the idea of someone who is not dependable and lacks good judgment.