noun
a person or thing that is completely different or opposite to another
adverb
completely different or opposite in nature or character
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Their opinions on the matter were poles apart, with one supporting the proposal and the other vehemently against it.
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When it comes to music taste, we are poles apart - she loves pop while I prefer rock.
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Those two are like chalk and cheese, they're poles apart in terms of personality.
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Although they were twins, their personalities were poles apart - one was outgoing and social while the other was introverted and shy.