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