un-
Not probable
Unlikely
Not able to be undone
Irreversible
Restlessly eager
Impatient
Prohibited by law
Illegal
No longer produced
Discontinued
Lacking the skill, means, and opportunity to do something
Unable
Not connected with the previous subject
Irrelevent
Living forever
Immortal
Not according to the rules of logic
Illogical
Cause someone to lose confidence
Discourage
Out of the ordinary
Uncommon
The feeling of being annoyed by something
Irrtated
Not likely to be true
Improbable
Not authorized by the law
Illegitimate
An unfavorable circumstance
Disadvantage
A person without a paid job
Unemployed
Not having an obligation to do something
Irresponsible
Impossible
Not clear enough to be read
Illegible
Refusal to believe something
Disbelief
Very great, seeming to have no limits
Unbounded
Impossible to change
Irrevocable
A sudden strong wish to do something
Impulse
To light something and make it brighter
Illuminate
To make it known that you no longer have any connection with someone that you were closely connected with
Disown