"Im" is a common prefix in itself, you don't add a prefix to a prefix.
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Nonagenerian - somebody that is 90 or between 90 and 100 years old. prefix for nonagon
impassible, impossible, immobile, improper, immodest, impersonal...
December starts with "dec" because it was originally the tenth month. (November was ninth, October was eighth, and September was seventh.)
K is the letter which kilo starts with. Kilo is the prefix for one thousand (e.g. kilogram, kilometer, kilowatt, etc.).
I am an English scholar. I discovered that the word unpossible does NOT exist. I studied the English language long and hard to find this answer. Once again, the word unpossible does not exist due to it's improper prefix of un-. The correct word is impossible, using the prefix im-.