Etymology

sedulous

se·dul·ous
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Today it means: Of a person: diligent in application or pursuit; constant and persevering in business or in endeavours to effect a goal; steadily industrious. Full definition →

Latin sēdulus ← Proto-Indo-European *del-
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The story

  1. Proto-Indo-European · derived from*del-“to count, reckon”
  2. Latin · derived fromsēdulus“diligent, industrious, sedulous; solicitous; unremitting; zealous”
  3. English todaysedulous

From Latin sēdulus (“diligent, industrious, sedulous; solicitous; unremitting; zealous”) + English -ous. Sēdulus is probably derived from sēdulō (“diligently; carefully; purposely; zealously”) (possibly from sē- (prefix meaning ‘without’) + dolō (ablative singular of dolus (“deceit, deception; evil intent, malice”), ultimately from Proto-Indo-European *del- (“to count, reckon”))) + -us (suffix forming adjectives).

Words from the same roots

Proto-Indo-European*del- all →

tolltaletilttallowtottertolter

Etymology from Wiktionary, CC BY-SA 4.0.