Where does “unproportional” come from?

unproportional (English) comes from English proportional — At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. Symbol: ∝.

Ancestry of “unproportional”, step by step

unproportional traces back through two separate lines of ancestry.

via English proportional

StepLanguageWordMeaning
1EnglishproportionalAt a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. Symbol: ∝

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from English proportional