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Related to in conscience: in all conscience
in (all) conscience
Without guilt. Usually said to emphasize fairness in a transaction. Primarily heard in UK. In all conscience, I can't charge you more than the car is worth. No, I can't, in conscience, give you a better grade when you put such little effort into the assignment!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Also, in all good conscience. In all truth or fairness, as in I can't in conscience say that the meeting went well, or In all good conscience we can't support their stand on disarmament. [Late 1500s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in (all good) conscience
In all fairness; by any reasonable standard.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.