English
adultly
From adult + -ly.
A compound of adult + -ly
Proto-Indo-European *h₂el- ‘to grow’
…
Latin olēscō ‘to grow’
Latin adolescō ‘to grow up’
Latin adultus ‘grown up’
French adulte
English adult
Today it means
adv In an adult manner; not childishly.
Language periods are conventional ranges, not dates for this word.
Etymograph / adultly