noun
a person or thing that is completely different from another
adverb
completely different or opposite
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Their opinions on the matter were worlds apart, making it difficult to reach a consensus.
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Their tastes in music are worlds apart - she likes pop, he prefers rock.
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Their fashion sense is totally worlds apart - she's all about streetwear, he's into preppy style.
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Despite being siblings, their personalities are worlds apart, one being outgoing and the other introverted.