have something on one's conscience, to feel guilty about something, as an act that one considers wrong: She behaves as if she had something on her conscience.
in all conscience,
in all reason and fairness.
certainly; assuredly.
Also in conscience.
Origin of conscience
1175–1225;Middle English < Anglo-French < Latinconscientia knowledge, awareness, conscience. See con-, science
Related formscon·science·less, adjectivecon·science·less·ly, adverbcon·science·less·ness, nounsub·con·science, nounCan be confusedconscienceconscious
early 13c., from Old French conscience "conscience, innermost thoughts, desires, intentions; feelings" (12c.), from Latin conscientia "knowledge within oneself, sense of right, a moral sense," from conscientem (nominative consciens), present participle of conscire "be (mutually) aware," from com- "with," or "thoroughly" (see com-) + scire "to know" (see science).
Probably a loan-translation of Greek syneidesis, literally "with-knowledge." Sometimes nativized in Old English/Middle English as inwit. Russian also uses a loan-translation, so-vest, "conscience," literally "with-knowledge."
The awareness of a moral or ethical aspect to one's conduct together with the urge to prefer right over wrong.
The part of the superego that judges the ethical nature of one's actions and thoughts and then transmits such determinations to the ego for consideration.
