adjective
relating to or characteristic of a sister; having the relationship of a sister
adverb
in a manner characteristic of a sister
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The two women shared a strong sisterly bond that was evident in their actions towards each other.
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My sisterly advice to you is to always be true to yourself and follow your dreams.
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Me and my girls have a sisterly pact to always have each other's backs no matter what.
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The organization prides itself on fostering a sisterly atmosphere among its members, creating a sense of unity and support.