No-nonsense is a term used to describe a person who is practical, straightforward, and down-to-earth. Its antonym, on the other hand, implies the opposite. Some of the antonyms for "no-nonsense" include flippant, frivolous, and unconcerned. People described as flippant tend to be careless, lacking seriousness or thoughtfulness. Frivolous individuals are more interested in trivial matters rather than important ones. Unconcerned people are indifferent or apathetic and do not put much effort into important tasks. These antonyms highlight the contrast between a practical, efficient individual and someone who is light-hearted, unthinking, or uninterested.