Un. Such a small word but it has such power. The power to negate, to destroy.
To make faithfulness into unfaithfulnness. To turn healthy into unhealthy.
The most prolific of prefixes in the English language, un turns up all over the place. Although in terms of changing the meaning of a word to ‘not’, it shares the limelight with im (eg improbable), and a (eg aseptic).
How many un words can you think of? I bet it’s quite a few. Strong little word, eh?