-nt adjective
Etymology: Middle English, from Middle French, from Latin diligent-, diligens, present participle of diligere to esteem highly, love, from di- (from dis- apart) + -ligere (from legere to choose, gather) — more at dis- , legend
1. : characterized by steady, earnest, attentive, and energetic application and effort in a pursuit, vocation, or study : not lackadaisical
a diligent investigator
a diligent search
2. archaic : careful , observant , heedful
be you watchful, and let us be diligent — J.A.Froude
Synonyms: see busy