K
Knowledge x ignorance
Kill x ravine, save
Keen x blunt, dull, unwilling
Knowing x ignorant, unknowing
Kind x cruel
L
Light x darkness, shade
Landlord x tenant
Lack x plenty
Liberty x slavery, bondage
Love x hatred
Lad x lass
likeness x difference, unlikeness
Lenience x severity
Lose x find, gain
Laugh x weep
Lassen x extend, increase, enlarge
Like x dislike
Lead x follow
Lock x unlock
Long x short
Light x heavy
Loyal x treacherous, disloyal
Literate x illiterate
Luscious x dully, dry, insipid
Literal x figurative, metamorphical
Latest x earliest
Legitimate x illegitimate
Loose x tight
Languid x energetic, vigorous
Legible x illegible
Lawful x unlawful
Loud x low, soft
Latent x apparent, open
Liberal x orthodox, illiberal
M
Major x minor
Merit x demerit
Malice x goodwill
Melancholy x gaiety
Mistress x maid
Melody x discord, cacophony
Make x mar
Magnify x reduce
Mount x dismount
Mad x sane
Many x few
Mild x harsh
Maximum x minimum
Manly x unmanly, effeminate
Meagre x plentiful
Miserly x generous
Morbid x healthy
Modest x immodest
Mental x physical
Male x female
Masculine x feminine
Material x spiritual, immaterial
Miraculous x simple, ordinary
Mighty x weak
Moral x immoral
Movable x immovable