adjective
a word that describes or modifies a noun or pronoun, in this case 'self-contained' describes something that is complete or independent
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The self-contained apartment had everything the tenant needed for a comfortable stay.
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I love staying in self-contained cabins when I go camping.
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The tiny house is so cool - it's totally self-contained!
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Her self-contained demeanor made it difficult for others to get to know her.