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sedulous (adj.)

1530s, from Latin sedulus "attentive, painstaking, diligent, busy, zealous," probably from sedulo (adv.) "sincerely, diligently," from sedolo "without deception or guile," from se- "without, apart" (see secret (n.)) + dolo, ablative of dolus "deception, guile," cognate with Greek dolos "ruse, snare." Related: Sedulously; sedulousness.

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Definitions of sedulous

sedulous (adj.)
marked by care and persistent effort;
sedulous pursuit of legal and moral principles
Synonyms: assiduous
From wordnet.princeton.edu