adjective
an adjective describes a noun or pronoun; 'janus faced' describes someone who is two-faced or deceitful
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The politician's janus-faced behavior was evident as he spoke differently to different groups of people.
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I don't trust her, she's so janus-faced, always saying one thing and doing another.
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I can't stand that janus-faced friend of yours, always gossiping behind people's backs.
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The mirror reflected a janus-faced image, showing both the light and dark sides of the person's personality.