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English word scrupulous comes from Latin scrupulus
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scrupulus (Latin)
(figuratively) Anxiety, uneasiness, solicitude, difficulty, doubt, scruple.. A small sharp or pointed stone.. The twenty-fourth part of an ounce.
scrupulosus (Latin)
Full of sharp stones. Exact, precise, anxious, careful, scrupulous. Rough, rugged. Steep.
scrupuleux (Middle French)
scrupulous (English)
Exactly and carefully conducted.. Having scruples or compunctions.. Precise; exact or strict.