in·ap·pre·cia·ble /ˌɪnəˈpriʃəbəl, ˈprɪʃ(i)əbəl/
(a.)微不足道的
In·ap·pre·ci·a·ble a. Not appreciable; too small to be perceived; incapable of being duly valued or estimated.
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inappreciable
adj : too small to make a significant difference; "inappreciable
fluctuations in temperature"