Diligently
From BiblePortal Wikipedia
King James Dictionary [1]
Diligently, adv. With steady application and care with industry or assiduity not carelessly not negligently.
Ye shall diligently keep the commandments of the Lord your God. Deuteronomy 6 .
Webster's Dictionary [2]
(adv.) In a diligent manner; not carelessly; not negligently; with industry or assiduity.