1228: English Right-Hand Rule Apr 20, 2018

There is a reason why negative affixes [1] are going to be prefixes in English is the same reason why derivational affixes such as '-al', '-ness' and '-ate' will be suffixes. English has what is called the "English right-hand rule" which states that usually, the right-most element is the head of the word, and will determine the syntax and or meaning. This is true of most adjectives, compounds where the first element acts almost like an adjective, and affixes. With the latter, negating prefixes such as 'in-', 'un-' and 'non-' all can be attached to adjectives (among other things) and the word will still remain an adjective (or whatever else) whereas the aforementioned suffixes will all make a word of one part of speech become a word of another lexical class. This is the case with most affixes in other Germanic languages as well, though there are a few notable exceptions within each, and is one of many significant reasons why English will not be considered a Romance language despite strong influences from vocabulary.
To see some hypothetical Word Facts, visit Patreon.com/wordfacts. Check out the Youtube too: https://youtu.be/Kgg5P7IIzvk