Where does “childishness” come from?

Childishness is derived from Middle English -nesse, Old English -nes, and Proto-Germanic -inassuz, a suffix forming abstract nouns from adjectives describing a quality or state.

childishness (English): The state or characteristic of being childish;...

Definitions

  1. The state or characteristic of being childish;...

Ancestry of “childishness”, step by step

StepLanguageWordMeaning
1English-nessAppended to adjectives to form nouns meaning "the...
2Middle English-nesseAffixed to adjectives to form abstract nouns...
3Old English-nesUsed to form abstract nouns, usually from...
4Proto-West Germanic-nassīUsed to form abstract nouns, usually from...
5Proto-Germanic-inassuz-ness
6Proto-West Germanic-ness, -th
7Proto-Germanic-į̄-th
8Proto-Indo-European-íh₂
9Proto-Indo-European-h₂Creates collective nouns, which refer to groups...
Every word from Proto-Indo-European -h₂