The prefix -un in English means "not" or "the opposite of". For example, unhappy is a way of saying "not happy".
The prefix -un can be used with adjectives (e.g. happy, usual), adverbs (e.g. happily, usually), and verbs (e.g. do). Where would we be in computing without the Undo command?!
Other un- words include:
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words beginning with un: * unit * untie * unique * unicycle * uncle * under * understand * unhappy * uncommon * unhealthy * untie * uneventable * uneven * until * untangle * unwind * uninterested * unkind * untidy * unveil * untouchable * untrue * unruly * unstrap * unsettled * unroll * unreasonable * unpleasant * unplugged * unquestioning * unscrew * unripe * ungrateful * unfortunate * unilateral * unguent * unfasten * unbutton * unfamiliar * unfailing * union * uncut * undaunted * unaided * unaltered * untamed * unclear * uncaring * uncontrolled
Unidentified
under
unnatural
unkind
untied
untreated
unrelated
unbelievable
unavailable
unanswered
unable
unsavory
unmentionable
unappreciated
unable
unacceptable
unaccompanied
unachievable
unadventurous
unaffordable
unafraid
unaltered
unambitious
unappetizing
unapproved
unattached
unaware
unbearable
unbeatable
unbelievable
unblemished
unbolt
unbreakable
unbuttoned
uncanny
unceasing
uncertain
unchained
unchanging
uncivilized
unclean
unclimbable
unclip
uncluttered
uncomfortable
uncommon
unconcerned
unconnected
unconscious
uncontaminated
unconvinced
uncovered
undecided
undeniable
undeserved
undesirable
undrinkable
unemployed
uneven
unexpected
unfashionable
unfasten
unfinished
unforgettable
unglued
ungoverned
unhappiness
unhappy
unhelpful
unhurried
unidentified
unimaginable
unintentional
unjust
unknown
unkind
unloading
unlucky
unmatched
unmanned
unmusical
unnatural
unnoticed
unobserved
unoccupied
unpack
unpleasant
unplug
unprecedented
unpredictable
unprintable
unproductive
unqualified
unreal
unreasonable
unreliable
unripe
unruly
unsafe
unscrew
unsettled
unskilled
unspoiled
unsuited
unsurprising
unsweetened
unthinkable
untidy
untitled
untruthful
unusual
unusable
unvaried
unwanted
unwell
unwilling
unwind
unzipped
I'm sure there are many others. That's a decent list for now. Please feel free to improve this answer.