inappreciable
UK: ˌɪnəˈpriːʃəbl | US: ˌɪnəˈpriːʃəbl
adj. too small or insignificant to be valued or perceived
adj. impossible to appreciate or assess adequately
The word combines the negative prefix "in-" (from Latin "in-", meaning "not") with the root "appreci" (from Latin "appretiare", meaning "to value or appraise") and the suffix "-able" (indicating capability). Originally tied to the concept of valuation, "inappreciable" evolved to describe things too minor or subtle to be measured or acknowledged.
The difference in their performance was inappreciable to the untrained eye.
Over time, the erosion caused inappreciable changes to the landscape.
His contributions, though inappreciable at first, proved vital later.
The chemical reaction produced an inappreciable amount of heat.
She felt her efforts were inappreciable compared to the team's overall success.