Where does “error-free” come from?

error-free (English) comes from English Free, from English faller, from English -er, from Middle English -er, from Old French -er, from Latin -āre, from Proto-Italic -āō, from Proto-Indo-European -eh₂yéti — he, she.

Ancestry of “error-free”, step by step

error-free traces back through two separate lines of ancestry.

via English Free

StepLanguageWordMeaning
1EnglishFreeUnconstrained
2EnglishfallerOne who falls; A fruit that falls from the tree,...
3English-erA person or thing that does an action indicated...
4Middle English-eragentive suffix; agent noun suffix
5Old French-erAlternative form of -ier, verbal suffix;...
6Latin-ārefirst conjugation
7Proto-Italic-āōForms primarily denominative verbs
8Proto-Indo-European-eh₂yétiCreates iterative/ frequentative/ intensive...
9Proto-Indo-European-yétiCreates intransitive, often deponent,...
10Proto-Indo-Europeanyé-
11Chichewaiyehe, she

via English error

StepLanguageWordMeaning
1EnglisherrorThe state, quality, or condition of being wrong;...
2Middle Englisherrour
3Old Frencherrorto err; to make an error
4Latinerrorwandering; wavering, uncertainty; error, mistake,...
5Latin-orused to form a third-declension masculine...
6Proto-Italic-ōsCreates masculine action nouns or result nouns...
7Proto-Indo-European-ōsCreates masculine and feminine action nouns or...
8Proto-Indo-European-oss
9Proto-Indo-European-osCreates action nouns or result nouns from verbs;...
Every word from Chichewa iye