Flummeries are defined as trivial, ornamental, or showy objects or activities. The antonyms for flummeries would be serious, substantial, and practical. Serious things are significant and important, they require a lot of effort and attention to detail. Substantial things are meaningful and have value, they make a meaningful impact in people's lives. Practical things are useful and functional, they serve a purpose and solve problems. Therefore, if someone wants to get things done, they should avoid flummeries and focus on things that are serious, substantial, and practical. These words represent qualities that make a difference and contribute to a positive outcome.