Where does “loony” come from?

Loony derives from English lunatic, from Middle English lunatik, from Old French lunatique, from Late Latin lunaticus meaning moon-affected, based on Latin luna meaning moon with the adjectival suffix -icus and Proto-Indo-European -kos, from the root lewk- meaning to shine.

loony (English): Insane; Very silly, absurd; An insane or very...

Definitions

  1. Insane; Very silly, absurd; An insane or very...

Ancestry of “loony”, step by step

StepLanguageWordMeaning
1EnglishloonAn idler, a lout; A boy, a lad; A harlot;...
2Middle Englishlouento low
3Middle EnglishloueAlternative form of lah
4Middle Englishlahlow
5Old Norselágrlow; short
6Germanlagerfirst-person singular present of lagern; singular...
7Middle High Germanleger
8Old High Germanlegar
9Old Norselegr
10Proto-Germaniclegrąa lying, a place where one lies; camp
11Proto-Indo-Europeanlegʰ-to lie

Words derived from “loony

Every word from Proto-Indo-European legʰ-Every word from Proto-Germanic legrąEvery word from Old Norse legr
loony — Etymology, Origin & Word History | Etymology Explorer