Where does “ill-behaved” come from?

ill-behaved (English) comes from English ill, from Middle English ille, from Old Norse íllr, from Proto-Germanic ilhilaz, from Proto-Indo-European h₁elḱ-.

ill-behaved (English): badly behaved; exhibiting bad behaviour

Definitions

  1. badly behaved; exhibiting bad behaviour

Ancestry of “ill-behaved”, step by step

ill-behaved traces back through two separate lines of ancestry.

via English ill

StepLanguageWordMeaning
1EnglishillEvil; wicked (of people)
2Middle Englishilleevil; wicked
3Old Norseíllrevil, bad
4Proto-Germanicilhilazbad, evil
5Proto-Indo-Europeanh₁elḱ-

via English behaved

StepLanguageWordMeaning
1Englishbehavedsimple past tense and past participle of behave;...
Every word from Proto-Indo-European h₁elḱ-