The "Un-" Prefix in German
Many adjectives and adverbs can be negated using the "un-" prefix.
- gerne => ungerne
- weit => unweit
- Gefahr, gefährlich => ungefährlich
- möglich => unmöglich
- bekannt => unbekannt
- geschickt => ungeschickt
Although antonyms exist for these words, they are not always perfectly interchangeable, especially in certain phrases.
- unweit => nah, in der Nähe
- unsinnig => absurd
- ungefährlich => harmlos
- ungerne => widerwillig
The "un-" word often seems to accentuate the negation. It is common to add an intensifier: ganz unweit, total unsinnig, nicht ganz ungefährlich, absolut ungerne.
For example, if you tell a tourist, "Die Kirche liegt unweit vom Parkplatz," you are anticipating the question, "Ist es dann noch weit vom Parkplatz zu Fuß?" If the question is still asked, you would clarify: "Nein, ganz im Gegenteil, sie liegt ganz nah dran."
In linguistics, a prefix is considered productive if it can be (and regularly is) freely attached to new words to create new meanings, and all native speakers would understand it spontaneously. One could even form a new word like unlustig or unpassend, and it would be understood without any problem.

