impure
"Pure-" is a common prefix for purity.
The suitable prefix for pure is pure it won't make sense of you put another set of words in front of pure it just would not make
pure
Well, honey, "pure" doesn't have a prefix or a suffix. It's just standing there all on its own, shining bright like a diamond. So, no need to go adding any extra bits to it - it's perfect just the way it is.
impure
A pure number: ai integer, a rational number, an irrational number. 7.3, for example, does not include a metric prefix.
Prefix=IN
The prefix for inadequate is in-. The prefix in- means not.
The prefix for include is in-. This prefix means not.
Yes, prefix does have a prefix. The prefix is pur-.
Demi has no prefix; it IS a prefix.
The prefix is in-. This prefix means not.