Wiktionary
nonsynthetic
a. Not synthetic.
WordNet
nonsynthetic
adj. involving or derived from living organisms; free from chemical treatments or additives; "organic gardening is more natural"; "nonsynthetic fertilizer"
Usage examples of "nonsynthetic".
Says it's the first nonsynthetic stuff he's had in ages except grain products.
Unlike many nonsynthetic beings, he could choose to forgo sleep without suffering any ill effects.