adjective
A word that describes or modifies a noun, in this case 'youngest' describes the noun it is referring to as being the most youthful or least old in a group.
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The youngest member of the team showed great potential during the project.
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My youngest sister is always borrowing my clothes without asking.
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That party was lit, even the youngest ones were having a blast.
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As the youngest in the family, she often felt like she had to prove herself more than her siblings.