argumentativelyargumentatively

Argumentatively comes from Latin argūmentor ‘to adduce arguments or proof of something,…’, from arguō ‘to clarify, to make plain’, and ultimately from Proto-Indo-European *h₂erǵ- ‘white, shining’.

1. Proto-Indo-Europeanc. 4500–2500 BCE*h₂erǵ-¹‘white, shining’reconstructed
2. Proto-Indo-Europeanc. 4500–2500 BCE*h₂érǵus¹reconstructed
3. Proto-Italicc. 1500–700 BCE*argus¹uncertain
4. Latinc. 75 BCE–200 CEarguō¹‘to clarify, to make plain’
5. Latinc. 75 BCE–200 CEargūmentum¹‘argument’
6. Latinc. 75 BCE–200 CEargūmentor¹‘to adduce arguments or proof of something, prove, reason’
7. Medieval Latinmodernargūmentātīvus¹
8. Middle Englishc. 1150–1500argumentatif¹
9. English1500–presentargumentative¹
10. Englishtodayargumentatively¹

1. ¹ Wiktionary, English argumentatively