WordPrefixMeaning
unhappyun-not happy
unfairun-not fair
unkindun-not kind
untrueun-not true
unknownun-not known
unsafeun-not safe
uneasyun-not easy; anxious
uncleanun-not clean
unfitun-not fit
untidyun-not tidy
unlockun-to open or undo a lock
unwrapun-to remove a wrapping
unloadun-to remove a load
unplugun-to remove from a socket
untieun-to undo a tie or knot
disagreedis-to not agree
disappeardis-to go out of sight
dishonestdis-not honest
dislikedis-not like
disobeydis-not obey
disapprovedis-not approve
disallowdis-to not allow
disconnectdis-to break a connection
displeasedis-to make someone unhappy
disloyaldis-not loyal
disorganizeddis-not organized
disrespectdis-lack of respect
disadvantagedis-an unfavorable condition
disappeardis-to vanish or go away
disqualifydis-to make ineligible
inactivein-not active
incorrectin-not correct
incompletein-not complete
insanein-not sane
invisiblein-not visible
insecurein-not secure
informalin-not formal
inconvenientin-not convenient
indecentin-not decent
indecisivein-not able to decide
impoliteim-not polite
impossibleim-not possible
impatientim-not patient
imperfectim-not perfect
immobileim-not moving
impureim-not pure
improperim-not proper
impersonalim-lacking personal feeling
imbalanceim-lack of balance
immaterialim-not important or relevant
impreciseim-not accurate
nonstopnon-without stopping
nonsensenon-something that does not make sense
nonprofitnon-not for profit
nonlivingnon-not alive
nonrenewablenon-cannot be renewed
nonsmokernon-a person who does not smoke
nonfictionnon-writing that is true or factual
nonstopnon-continuous; without pause
nonviolentnon-not using violence
nonverbalnon-without spoken language
nonsticknon-surface that doesn’t allow sticking
nonfatnon-without fat
nonresidentnon-not living in a place
nonessentialnon-not necessary
nontraditionalnon-not based on tradition
nonspecificnon-not specific
nonfunctionalnon-not working properly
nonpaymentnon-failure to pay
unnecessaryun-not needed
untouchableun-cannot be touched
unawareun-not aware
uneasyun-uncomfortable
unhelpfulun-not helpful
unbeatableun-cannot be beaten
unpredictableun-not able to be predicted
uninterruptedun-not interrupted
unpreparedun-not ready
uncertainun-not sure
discontentdis-not satisfied
dissimilardis-not similar
disorganizeddis-not arranged well
disloyaltydis-betrayal
disinterestdis-lack of interest
disfiguredis-to spoil the appearance
invisiblein-can’t be seen
inhumanin-lacking compassion
inexperiencein-lack of experience
inconsideratein-not thoughtful
insincerein-not sincere
immodestim-not modest
impoliteim-not courteous
immovableim-cannot be moved
imbalancedim-lacking balance
impartialim-fair; not biased
nonhumannon-not human
nonnativenon-not originally from a place
nonsensitivenon-not easily affected
nonappearancenon-failure to appear
nonbelievernon-someone who does not believe
nonconductornon-does not conduct electricity or heat
noncompetitivenon-not competitive
noncooperativenon-not willing to help