Prefix meaning “not” -“un” đi với nhiều từ khác nhau trừ từ chỉ nghề nghiệp unacceptable unafraid unattached unblemished unceasing unclean uncommon unconvinced undesirable unfasten unhappiness unintentional unlucky unobserved unplug unreasonable unscrew unsurprising untruthful unwell unable unaffordable unapproved unbelievable uncanny uncivilized uncomfortable uncontaminated undeserved unfashionable ungoverned unimaginable unloading unnoticed unpleasant unreal unsafe unsuited untitled unwanted unaccompanied unaltered unaware unbolt uncertain unclimbable unconcerned uncovered undrinkable unfinished unhelpful unjust unmatched unoccupied unprintable unreliable unsettled unsweetened unusual unwilling unachievable unambitious unbearable unbreakable unchained unclip unconnected undecided uneven unfogettable unhurried unknown unmusical unpack unproductive unripe unskilled unthinkable unusable unwind unadventurous unappetizing unbeatable unbuttoned unchanging uncluttered unconscious undeniable unexpected ungetatable unidentified unkind unnatural unpeopled unqualified unruly unspoiled untidy unvaried unzipped - im đuợc dùng trước các từ bắt đầu bằng “m,p” ví dụ như “impolite, impatient” • immature • immemorial • immoderate • immortal • immovable • impaired • improbable • immutable • impatient • impenetrable • imperfect • impiety • implausible • impolite • imponderable • imprecise • impropriety • impurity • impudent • impropriety • improbable - “il” il được dùng trứoc các tính từ bắt đầu bằng “L” illegible illegal, illegible, illiterate, illogical,illuminate, illustrate - “ir” đuợc bắt đầu bằng các từ bắt đầu bằng”r” • irresponsible • irregular • irrevocable • irrefutable • irradiate • irreconcilable • irredeemable • irreducible • irrefutable • irregularity • irrelevant • irreverence • irreligious • irreparable • irreplaceable • irreversible • irresolute • irretrievable • irresistible • Irrelevant - “dis” đựoc sử dụng truớc một số tính từ, danh từ, và động từ display discharge discord discard discount discourage discredit discreet discuss distaste disembody distrust disable distort disappear disarray disable disassemble disbelief discover disdain dissuade disallow disease dissect dissection disfigure disengage disparage dismiss dispassionate dissipate dispute dissertation disestablish dissevered disturbance disavow disarm disarmament disuse disburse distal dismal dismissal disorder disorderly dissuasion distract distraction discard discord disgorge disjointed distorts distortion district disfavor dissolve -“in” được sử dụng trong giới hạn một vài từ : invisible