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Duplicitous
Double Meanings
The word 'duplicitous' often implies using ambiguous language to conceal the truth or to mislead. 
Negative Connotation
'Duplicitous' has a strongly negative connotation, suggesting intentional deception and untrustworthiness. 
Interpersonal Relations
Using 'duplicitous' in relation to someone can damage relationships, as it denotes betrayal. 