Iffy/ˈɪfi/ Definition 1 of 1Pro Tip 1/3Reliability Concerns Use 'iffy' to express skepticism about how dependable someone or something is. The car has been making strange noises; it's looking a bit iffy. Pro Tip 2/3Plan Flexibility Suggesting that plans could change due to uncertainty? 'Iffy' is your word. The trip is iffy—it all depends on the funding approval. Pro Tip 3/3Informal Context 'Iffy' is casual; use it in everyday conversation rather than formal writing. I'm iffy about seeing that movie; it's gotten mixed reviews.