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Incorruptible
Unwavering Ethics
Use 'incorruptible' to describe someone with strong moral principles who won't compromise, even in difficult situations. 
Impervious to Temptation
'Incorruptible' implies a person is immune to corruption or bribery, often in political or power scenarios. 
Positive Connotation
'Incorruptible' carries a highly positive meaning, showing admiration for someone's integrity. 