misargumentmisargument

Misargument comes from Latin argūmentum ‘argument’, and goes back to arguō ‘to clarify, to make plain’.

1. Latinc. 75 BCE–200 CEarguō¹‘to clarify, to make plain’
2. Latinc. 75 BCE–200 CEargūmentum¹‘argument’
3. Anglo-Normanc. 1066–1400arguement¹
4. Middle Englishc. 1150–1500argument¹
5. English1500–presentargument¹
6. Englishearliest quotation 1847misargument¹

1. ¹ Wiktionary, English misargument
2. Earliest quotation in Wiktionary’s entry: 1847, John Howard Hinton, Julius Charles Hare: “should not merely try to establish our own opinion…”.

Earlier history uncertain. See Wiktionary.