Etymology
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misgiving (n.)

c. 1600, "feeling of mistrust or sudden apprehension, a failing of confidence," verbal noun from misgive "make apprehensive, cause to feel doubt" (1510s), usually said of one's heart or mind, from mis- (1) "badly, wrongly" + give (v.) in its secondary Middle English sense of "suggest." Related: Misgivings.

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scruple (n.)
"moral misgiving, pang of conscience," late 14c., from Old French scrupule (14c.), from Latin scrupulus "uneasiness, anxiety, pricking of conscience," literally "small sharp stone," diminutive of scrupus "sharp stone or pebble," used figuratively by Cicero for a cause of uneasiness or anxiety, probably from the notion of having a pebble in one's shoe. The word in the more literal Latin sense of "small unit of weight or measurement" is attested in English from late 14c.
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