R
Retreat x advance
Relief x aggravation
Recklessness x prudence, carefulness
Roar x whisper
Repute x disrepute
Rear x front
Ruler x ruled, subject
Recovery x loss
Raise x lower
Remember x forget
Recover x lose, replace
Rejoice x lament
Rectify x falsify
Relish x dislike
Repress x encourage
Refuse x allow
Rise x fall, set
Reveal x conceal
Reject x accept
Relieve x aggravate
Resolve x hesitate
Restore x appropriate
Record x obliterate
Retreat x advance
Resist x submit, yield
Religious x secular, irreligious
Rash x balanced, cautious
Row x ripe
Romantic x prosaic, classical
Rapid x slow, tardy
Relevant x irrelevant
Repulsive x attractive
Regular x irregular
Rigid x flexible
Ruthless x humane
Restless x calm
Rational x irrational
Rude x polite
Rare x common
Real x unreal
Remote x near
Right x wrong
Relative x absolute
S
Smile x frown
Storm x calm
Saint x sinner
Safety x danger
Service x disservice
Sin x virtue
Success x failure
Synonyms x antonyms
Solid x liquid
Servant x master
Sympathy x antipathy
Satisfaction x dissatisfaction
Silence x noise
Surplus x deficit
Security x insecurity
Shorten x lengthen
Sink x float
Solidify x liquefy
Strengthen x weaken
Sleep x wake
Simple x intricate, complex
Strong x weak
Steadfast x wavering, fickle
Serious x light, non-serious
Severe x mild
Slow x prompt
Sensible x callous
Sprightly x dull
Sublime x liquid
Savage x civilized
Secret x open, public
Shy x bold
Sober x excited, drunk
Special x ordinary
Spiritual x material
Stationary x moving
Sweet x bitter, sour
Salubrious x lenient
Salient x unimportant
Strange x familiar
Sacred x profane, unholy
Single x many, multiple
Sane x insane
Scanty x plentiful
Sensible x insensible
Sharp x blunt
Soft x hard, stubborn
Straight x crooked, curved
Superior x inferior
Swift x slow
