Jejunely is an adjective that refers to something that is lacking in substance, interest or depth. As such, its antonyms reflect the opposite characteristics. The first antonym that comes to mind is "profoundly," which means deeply meaningful, insightful, and thought-provoking. Conversely, "shallowly" is another antonym that describes something superficial and lacking in depth. Similarly, "richly" refers to qualities such as abundance, variety, and complexity, whereas "sparse" suggests scarcity or sparseness. Finally, "colorfully" stands in opposition to jejunely as it sums up the qualities of something that is vivid, bright and lively. Together, these words provide a comprehensive set of opposites that express the richness of language and its ability to convey complex meanings.