Un almost always means "not."
unbelievable
unknowingly
In is sometimes just a different spelling of un:
inaccessible
invariant
But sometimes in is an alternate spelling of the intensive prefix en:
infuriate
insure
The two uses of in mean almost the opposite of each other, which leads to one of the most misunderstood words in the English language: inflammable.
Most people think inflammable means "not flammable" or "cannot be set on fire." It actually means "capable of being set on fire" or "very likely to catch on fire." So when you see the word inflammable, it is almost impossible to know what it was meant to mean. Safety professionals advocate just using the word flammable when there is a danger of fire.
The word "packed" can use the prefixes re-, pre-, mis- and un- (here un can also mean de, or non which are not used).
un
inpolite
You could use UN or OVER as prefixes for the word ripe.
You could use UN or OVER as prefixes for the word ripe.
Un- and re- are two prefixes for "do."
The prefixes IN- and UN- can be used with the word alter in several different words:InalterableInalterablenessInalterabilityInalterablyUnalterableUnalterabilityUnalterablyUnalteredUnaltering
un-
The prefix "dis-" typically means the opposite or absence of something, while "de-" often indicates removal or separation. For example, "disagree" means to have a different opinion, while "detached" means not attached.
Un and Sub.
un and ex
The negative prefixes that can be used with the word "exact" are "in" and "inexact." For example, "inexact measurement" means a measurement that is not completely accurate.