Prefixes are a group of letters that change the meaning of a word when they are added to the start. The prefix un- usually means 'not', so the new word means the opposite of the original.

If you do find such a word, it is probably an example of a completely different prefix in-, meaning in or towards (incoming, infield, indwell). In- is much more restricted than un-. Un- is freely ...

A prefix is “a syllable, group of syllables, or word joined to the beginning of another word or base to alter its meaning or create a new word.” Conveniently, the “pre-” in “prefix” is ...

Prefixes are a group of letters that change the meaning of a word when they are added to the start. The prefix un- usually means 'not', so the new word means the opposite of the original.