The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Proto-Indo-European*h₂erǵ-
- Proto-Indo-European*h₂érǵus
- Proto-Italic*argusder.?
- Latinarguō
- Latinargūmentum
- Latinargūmentor
- Medieval Latinargūmentātīvus
- Middle Englishargumentatif
- Englishargumentative
- English todayunargumentative
From un- + argumentative.
Etymology from Wiktionary, CC BY-SA 4.0.