noun

conscience

conscience

He has a guilty conscience.

He has a guilty conscience.

Let your conscience be your guide.

Let your conscience be your guide.

((a clear/guilty ~)) to have a clear/guilty conscience He has a guilty conscience.

Synonyms: moral sense, scruples, principles

From Latin con- ('with') + scire ('to know'). It means an 'inner knowledge' or sense of right and wrong.

Think of 'con' (with) + 'science' (knowledge). It's the knowledge you have *with* yourself about what is right.

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