ADULTLY
Meaning of ADULTLY in English
əˈdəltlē, ˈaˌd-, aˈd-, -li adverb
: in a manner typical of an adult
you're too adultly serious — Aldous Huxley
adultly uncompromising
Webster's New International English Dictionary.
Новый международный словарь английского языка Webster.
2012