Negation and contrast
In these words, 非 (fēi) adds a sense of intensity, exception, or contrast.
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非has 2 distinct senses for the same pronunciation

In these words, 非 (fēi) adds a sense of intensity, exception, or contrast.
extremely
nothing but; no more than; simply
In these words, 非 (fēi) relates to judgment, legality, or place names.
right and wrong; quarrel; dispute
In these fixed expressions, 非 (fēi) creates emphasis or formal meaning.
Extraordinary / Remarkable
appear to be true but is actually false / specious
there is nothing wrong with it / it's understandable
Completely changed / Totally different
The weather today is extremely good.
North Africa has many deserts.
South Africa has many beautiful natural landscapes.
I want to travel to Africa.
This is a non-official event.
Explore characters by relationship
Characters from the same exam level.
Characters pronounced "fei".
Characters with radical "非".