Top Definition
1. Noun

An adult whose interests and behaviour follow youth culture; someone who has not fully grown up.

2. Adjective

An adult who has this pattern of behaviour.
1. I really cannot figure out how he dares to wear that outfit at 50. He's just an adultescent.

2. Let us go to another disco. This one is full of adultescents.
by Ezechiel February 20, 2007

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