IPA: /əˈdʌltˌlaɪk/
KK: /əˈdʌltˌlaɪk/
Having qualities or characteristics that are typical of an adult.
Her adultlike behavior surprised everyone at the party.
Comparative: more adultlike
Superlative: most adultlike
Adultlike → It is formed from "adult" (from Latin "adultus", meaning grown up or mature) and "-like" (meaning resembling or characteristic of). The word "adultlike" describes something that resembles or has characteristics of an adult.
Think of the word 'adult' meaning grown up, and remember that 'adultlike' refers to something that has the qualities or characteristics of an adult.