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scruple [scruple 词源字典]: scruple: [16] Latin scrūpus meant ‘sharp stone’, and the notion of something troubling the mind like a painful stone in the shoe led to its metaphorical use for ‘anxiety, doubt, particularly over a moral issue’. Both meanings were carried over into the diminutive form scrūpulus, which also came to be used for a very small unit of weight. This passed into English via French scrupule as scruple, on the way losing the literal sense ‘small stone’.
[scruple etymology, scruple origin, 英语词源]
infestation (n.): early 15c., from Late Latin infestationem (nominative infestatio) "a troubling, disturbing, molesting," noun of action from past participle stem of infestare (see infest).
over-trouble (v.): 1580s, from over- + trouble (v.). Related: Over-troubled; over-troubling.
trouble (v.): c. 1200, from Old French trubler, metathesis of turbler, torbler "to trouble, disturb; make cloudy, stir up, mix" (11c.), from Vulgar Latin *turbulare, from Late Latin turbidare "to trouble, make turbid," from Latin turbidus (see turbid). Related: Troubled; troubling.