Con-
inconvenient
No, "handy" is not a prefix. It is an adjective meaning convenient or useful.
Con-
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The prefix that helps to form "inconvenience" is "in-". Adding "in-" at the beginning of "convenience" changes the meaning to indicate something that is not convenient or causing difficulty.
un-
Convenient is an adjective.
Prefix=IN
The prefix for inadequate is in-. The prefix in- means not.
Yes, prefix does have a prefix. The prefix is pur-.
The prefix for include is in-. This prefix means not.
Demi has no prefix; it IS a prefix.