scrupleyoudaoicibaDictYouDict
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’.
infestation (n.)youdaoicibaDictYouDict
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.)youdaoicibaDictYouDict
1580s, from over- + trouble (v.). Related: Over-troubled; over-troubling.
trouble (v.)youdaoicibaDictYouDict
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.