Where does “flagacious” come from?

flagacious (English) comes from English flagitious, from Old French flagitieux, from Latin flāgitium, from Latin -ium, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “flagacious”, step by step

StepLanguageWordMeaning
1EnglishflagitiousGuilty of terrible crimes; wicked, criminal;...
2Old Frenchflagitieux
3Latinflāgitiumdisgraceful or shameful action, deed, or crime; scandal
4Latin-iumSuffix used to form abstract nouns, sometimes...
5Latin-iusforming adjectives from nouns; nominative neuter...
6Proto-Italic-jōsForms comparative adjectives
7Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yósEvery word from Latin -iumEvery word from Latin -ius