Prefix - a word, letter, or number placed before another. This, therefore, means that the entire word 'insufficient' is not a prefix, however, the first letters "in" in this word is the prefix.
The prefix "in" could be used to make the opposite word insufficient.
Insufficient
It means "not" e.g. "insufficient" vs "sufficient"
Undercooked, where "under-" is the prefix meaning "less than or insufficient".
insufficient, inflammable, inadvertent, inadequite, insecure, indelible, inaudible
"In" as in "inadequate," meaning less than adequate or lacking.
Un
A prefix is added to the beginning of a base word to change its meaning or create a new word. The prefix can alter the original meaning of the base word by indicating direction, negation, time, or number, among other things.
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-.