The opposites of KNOWN
unknown
The opposites of POLITE
impolite
The opposites of EXPENSIVE
inexpensive
The opposites of HAPPY
unhappy
The opposites of WELL
unwell
The opposites of CORRECT
incorrect
The opposites of VISIBLE
invisible
The opposites of HEALTHY
unhealthy
The opposites of ACTIVE
inactive
The opposites of FRIENDLY
unfriendly
The opposites of FAIR
unfair
The opposites of POSSIBLE
impossible
The opposites of KIND
unkind
The opposites of PATIENT
impatient
The opposites of LUCKY
unlucky