N
Night x day
Nominalism x realism
Negate x accept
Neglect x care
Negative x positive
Natural x artificial
Neat x untidy
Notorious x famous
Nice x nasty
Noble x ignoble, base
O
Optimist x pessimist
Optimism x pessimism
Obligation x claim
Original x copy, duplicate
Open x shut, close
Offer x refuse
Obscure x clarify
Obey x disobey
Oppose x yield
Oral x written
Obstinate x yielding, submissive
Ominous x auspicious
Outward x inward
Old x young
Oscillating x steady, firm, stationary
Objective x subjective
Obedient x disobedient
Offensive x defensive, pleasing
Optional x compulsory
Odd x even
Ornamental x simple
Ordinary x extra-ordinary, uncommon
Opaque x transparent
P
Pleasure x pain
Plenty x scarcity
Punishment x reward
Peace x war
Profit x loss
Permission x prohibition
Patience x impatience
Prudence x recklessness
Philanthropist x misanthropist
Prohibition x permission
Poverty x affluence, richness
Part x whole
Prospect x retrospect
Prose x cons
Propulsion x repression
Philanthrope x misanthrope
Prodigality x parsimony
Patriotism x cosmopolitanism
Pride x humility, politeness
Paradise x hell, purgatory
Passion x coolness
Prosperity x adversity
Permit x prohibit
Punish x reward
Please x displease
Persist x relinquish
Pursue x avoid
Persuade x dissuade
Part x join
Praise x condemn, defame
Preliminary x final
Precede x succeed
Permanent x temporary
Public x private
Polite x impolite, rude
Pure x impure, adulterated
Progressive x regressive, retrogressive, retrograde
Particular x general
Physical x mental, spiritual
Precious x cheap, worthless
Plentiful x scarce
Positive x negative
Plain x showy, complex
Pompous x simple
Partial x fair, impartial
Pathetic x joyous
Practicable x impracticable
Prudent x imprudent
Q
Question x answer
Quick x slow
Quiet x noisy
Quarrelsome x friendly, peaceable
Questionable x unquestionable, reliable
Quicken x delay
Quixotic x realistic
Qualified x unconditional