callous and impervious
calmness and composure
calumny and exaggeration [calumny = maliciously lying to injure a reputation]
candor and kindness
cant and hypocrisy [cant = hypocritically pious language]
capable and efficient
capacity and ability
capricious and unreasonable
career and occupation
cares and anxieties
carping and ungenerous
casual and transient
causes and circumstances
cautious and reticent
celebrated and praised
celerity and violence [celerity = swiftness of action]
ceremony and splendor
certain and verifiable
chafe and exasperate
chagrin and despondency
chance and opportunity
change and variety
chaos and confusion
character and temperament
characteristic and complete
charges and insinuations
charm and perfection
chaste and refined
cheap and convenient
checked and thwarted
cheerfulness and gaiety
cherish and guard
chief and paramount
chilled and stiffened
choleric and sanguine [choleric = easily angered; bad-tempered]
[sanguine = cheerfully confident; optimistic]
churlishness and violence [churlish = boorish or vulgar]
citation and allusion
civility and communicativeness
civilized and cultured
clamorous and wild
claptrap and platitude
clarity and straightforwardness
classical and perspicuous [perspicuous = easy to understand]
clatter and clang
clear and decisive
cleverness and acuteness
clogged and dulled
clumsy and smudgy
coarse and grotesque