One who is legally an adult (18 years of age) but is still learning how to adult i.e. regularly make and eat quality food, keep living spaces clean, and do everything that your mom either had to nag you to do or just did for you.
Adultlings in college often seek the advice of full-grown adults about how to function in a responsible manner so they can fully transition into adult-hood. An adultling might say “how do I adult,” or “I suck at adulting.”
by Hanlizroose March 5, 2018
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A young adult that is still figuring out how to navigate the world as an adult
She's still an adultling - learning how to manage her own health insurance the year.
by Ft716 February 4, 2016
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Like an Adulterer, but much worse. Someone who cheats on their spouse so much, they are akin to the Hitler of dating. It is rumoured that the original Adultler had as many as 6 million affairs in an event dubbed "The Hole-a-caust". Hole-a-Caust deniers say this is greatly exaggerated and that the actual number is likely much lower, perhaps 10 or 20.
"Well, duh... of course he cheated on you... he's a total Adultler"

"You sir, are worse than Hitler - you're an Adultler"
Source: adamfromtheblok, Canada, eh?
by adamfromtheblok November 9, 2005
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A person of adult age (18+) that acts like and throws tantrums like a toddler when their entitlement and first world problems are the worst. A word for someone who cannot grasp the concept that life happens and things don’t always go their way.
Karen is an Adultler.
by RockinMarcie September 4, 2021
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