The term "decompositional" refers to the process of breaking down into simpler elements or substances, usually resulting in decay or deterioration. Antonyms for this term could include words that describe actions or processes that build up, construct, or create. Examples of antonyms for "decompositional" might include terms such as "constructive," "synthetic," "growth-oriented," "reconstructive," or "build-up." These words suggest the inverse of breaking down or deteriorating, instead emphasizing the idea of generating or developing something new, stronger, or more complex. By contrast, antonyms that express a state of preservation or stability could include words such as "preserved," "conserved," "stable," or "intact.