adjective
an adjective describes or modifies a noun or pronoun, in this case 'compulsive' describes a behavior or tendency that is difficult to control
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The patient exhibited compulsive behavior, often engaging in repetitive actions.
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She has a compulsive need to check her phone every few minutes.
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He's a compulsive shopper, always buying things he doesn't need.
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His compulsive need for perfection often gets in the way of completing tasks.