adjective
a word that describes or gives more information about a noun, in this case 'adultoid' describes something that is similar to an adult
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The research study focused on the behavior patterns of adultoid individuals.
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I heard that adultoid is the new term for young adults who still act like teenagers.
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She's dating an adultoid who refuses to grow up and take responsibility.
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The company's corporate culture was described as adultoid, lacking maturity and professionalism.