Complement
A thing that completes or brings to perfection
Addition, supplement, companion
Complaint
Cooperative, accommodation
Concrete
Tangible, existing, real
Consensus
Agreement, Harmony, concurence
contguous
Adjacent, adjoining
Conundrum
Dilemma, difficulty
Copious
Abundant, plentiful
Corroborate
Authenticate, Verify
Craven
Timid, fearful
Credible
Believable, plausible
Culpable
blameworthy; deserving balme
Curmudgeon
bad-tempered person
debacle
a sudden collapse; a disastrous breakdown
debilitate
to weaken
debunk
to expose as false or exxaggerated
decimate
to destroy a large proportion of the number
decorum
dignified propriety of behavior, speech, dress
deduce
to draw a conclusion from given data
deem
believed, judged, considered
definitive
authoritative, the last word on the subject