ad-lib : impromptu :: aside : digression (=)
ad-lib : impromptu :: aside : divergent (=)

adapt ↔ remain unchangeable
adapt ↔ remain unchanged
adaptable ↔ unchangeable

desiccate ↔ add water to

addicted : dependency :: inured : tolerance

slippery : adhere :: dingy : glisten
indulge : adherent :: slovenly : dapper
indulgent : adherent :: slovenly : dapper (↔)
zealot : adherent :: fanatic : admirer (>)
adhere ↔ detach
adherent ↔ dissenter
adherent ↔ forerunner

adhesive : bind :: compass : orient
glue : adhesive :: etch : corrosive
tackiness : adhesive :: sharpness : scalpel

adjourn ↔ convene
adjourn ↔ convoke

adjunct ↔ essential element

admire : hero :: defer : leader
admire : paragon :: emulate : exemplar
despicable : admire :: paltry : covet
lionize : admire :: vituperate : despise
paragon : admire :: pariah : contempt
fanatic : admirer :: zealot : adherent (>)
abhor ↔ greatly admire
admire ↔ vituperate

admonish : caution :: ameliorate : improve
admonish : denounce :: persuade : convince (<)
admonish : denounce :: punish : pillory (<)
admonish : warning :: apprise : information
admonishment : castigation :: peccadillo : sin (<)
admonishment : warning :: alibi : exculpatory
warning : admonish :: alibi : exculpate
warning : admonishery :: alibi : exculpatory (=)

adoption ↔ renunciation

adroit : inept :: loquacious : succinct
adroit : ungainly :: loquacious : succinct (↔)
adroitness : inept :: difficulty : simplicity (↔)
adroit ↔ ham-handed
adroit ↔ inept
adroit ↔ ungainly
fumble ↔ handle adroitly

adulation : admiration :: aversion : disinclination
adulation ↔ disdain
adulation ↔ obloquy
adulation ↔ somber affection
adulation ↔ vituperation

adulterate : pristine :: demand : satisfied
adulterate : pristine :: demanding : satisfactory (↔)
adulterate : pristine :: dismantle : united
adulterate : pristine :: dismantle : unity
adulterate : pure :: bolster : weak
adulterate : pure :: brace : weak
adulterate : pure :: dismantle : unity
adulterate : pure :: embellish : austere
adulterate : purity :: enervate : vigor
adulterated ↔ unalloyed
unadulterated ↔ tainted

purist : adulteration :: stickler : approximation
purist : adulteration :: stickler : imprecision
adulteration ↔ purification

adumbration ↔ revelation

recoil ↔ advance boldly

advertence ↔ inattention
inadvertence ↔ careful attention

aerate : oxygen :: hydrate : water
aerate ↔ remove air from

aesthete : art :: gourmet : food
aesthete ↔ philistine

affability ↔ sullen
affability ↔ sullenness
affability ↔ surliness

affectation ↔ artlessness

adoration : affection :: abhorrence : dislike (>)
adoration : affection :: fascination : interest
adoration : affection :: terror : apprehension (>)
affection : adoration :: apprehension : terror (<)
caress : affection :: swagger : bravado
embrace : affection :: frown : displeasure
embrace : affection :: obeisance : esteem
embrace : affection :: shrug : indifference
fickle : affection :: mercurial : mood
kiss : affection :: hurl : disgust
kiss : affection :: scowl : displeasure
kiss : affection :: shrug : indifference
affectionate : love :: entice : tempt
affectionate : love :: enticing : tempt
adulation ↔ somber affection
affection ↔ antipathy
affection ↔ derelict
disaffection ↔ contentment

affiliation ↔ dissociation

affirm ↔ abjure
affirm ↔ belie
affirm ↔ debunk
affirm ↔ disavow
affirm ↔ gainsay
affirm ↔ imply
affirm ↔ refute
affirm ↔ repudiation
affirmation ↔ negation

affirmation ↔ negation

affluent ↔ impecunious
affluent ↔ indigent
affluent ↔ needy
affluent ↔ rarely
affluent ↔ scant

summarily ↔ after long deliberation

aggrandize ↔ abase
aggrandize ↔ disparage
aggrandize ↔ efface
aggrandize ↔ relegate
aggrandize ↔ undermine
self-aggrandizement ↔ self-abasement

aggravate ↔ allay
aggravate ↔ alleviate
aggravate ↔ ameliorate
aggravate ↔ assuage
aggravate ↔ succor
console ↔ aggravate grief

aggravating ↔ extenuating

aggression ↔ concession

aggrieve ↔ comfort
aggrieve ↔ gratify
aggrieve ↔ inspire
aggrieved ↔ buoyant

aghast ↔ undismayed

acrobat : agility :: surgeon : dexterity
agility : bungler :: veracity : dissembler
agility ↔ dilatoriness
agility ↔ hesitancy

calm : agitation :: :
tranquility : agitation :: abandon : inhibition (↔)

curmudgeon ↔ agreeable person

aid ↔ thwart
succor ↔ deny aid
thwart ↔ aid effectively

airtight : leak :: foolproof : fail
airtight : loophole :: :

alacrity : apathetic :: temerity : timid
alacrity : procrastinate :: husbandry : dissipate (↔)
alacrity : prompt :: acumen : shrewd
alacrity ↔ delay
alacrity ↔ dilatoriness
alacrity ↔ hesitance
alacrity ↔ hesitancy
alacrity ↔ languor
alacrity ↔ recalcitrance
alacrity ↔ reluctance
alacrity ↔ sluggishness

alchemy : chemistry :: astrology : astronomy
alchemy : chemistry :: false drug : treatment
alchemy : science :: nostrum : remedy

soporific : alertness :: analgesic : pain
soporific : alertness :: anesthetic : pain
alertness ↔ torpor

alienate ↔ reunite

aligned ↔ askew
aligned ↔ awry
aligned ↔ badly adjusted
aligned ↔ improperly adjusted
aligned ↔ irregular
aligned ↔ not affiliated
aligned ↔ skew
aligned ↔ warped

allay ↔ aggravate
allay ↔ arouse
allay ↔ compel
allay ↔ exacerbate
allay ↔ excite
allay ↔ foment
allay ↔ galvanize
allay ↔ increase the intensity of
allay ↔ intensify
allay ↔ irritate
allay ↔ provoke

allegory : fiction :: :

alliterate : remove :: blazon : efface (↔)
remove : alliterate :: efface : preen