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1. A strong uneasiness caused by a sense of guilt: stole the money without compunction. See Synonyms at penitence.
2. A sting of conscience or a pang of doubt aroused by wrongdoing or the prospect of wrongdoing: "commercial speculators and hired politicians who had no compunction about pillaging their country for personal gain" (Leo Damrosch).

[Middle English compunccioun, from Old French componction, from Late Latin compūnctiō, compūnctiōn-, puncture, sting of conscience, from Latin compūnctus, past participle of compungere, to sting : com-, intensive pref.; see com- + pungere, to prick; see peuk- in Indo-European roots.]

com·punc′tious (-shəs) adj.
com·punc′tious·ly adv.
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Feeling or expressing regret for one's sins or misdeeds:
References in classic literature ?
Mother and daughter adored each other and revered their son and brother; and Archer loved them with a tenderness made compunctious and uncritical by the sense of their exaggerated admiration, and by his secret satisfaction in it.
And young Powell would have grown weary and compunctious at last if it had not become manifest to him that he had not been alone in the highly incorrect occupation of watching the movements of Captain Anthony.
Shakespeare depicted Macbeth's path to crime as a tension between the pursuit of power associated with the witches and a conscience associated--significantly--with Macbeth's "nature," the same "compunctious visitings of nature" that Lady Macbeth disavows (1.5.45).
Since the reign of Salah al-Din or Saladin, European poets, fabulists, and authors of instructive prose wrestled with the sultan's dual identity as a fierce antagonist to Crusader armies and his reputation as a compunctious, highly moral knight.
(46) Although far from as worldly as some Abbasid caliphs, 'Umar is cast in a guilt-ridden and compunctious mood that is akin to the moods of the later caliphs al-Mansur, al-Rashid, al-Amin, al-Maamun, and al-Mu'tasim.
It is my contention, therefore, that the knowing with of conscience, as expounded by Perkins, bears unequivocal witness in Macbeth both discursively in the form of internal dialogue masquerading as external dialogue, and objectively in the figure of Banquo as Macbeth's compunctious Other.
That no compunctious visitings of nature Shake my fell purpose, nor keep peace between The effect and it!