critic.noun
one who forms and expresses judgments of the merits, faults, value, or truth of a matter; one who specializes especially professionally in the evaluation and appreciation of literary or artistic works (a film critic; a dance critic); one who tends to make harsh or carping judgments; a faultfinder

fault finding implies a querulous (inclined to find fault) or exacting temperament (a fault finding reviewer of celebrities)
captious suggests a readiness to detect trivial faults or raise objections on trivial grounds (a captious critic) 
carping implies an ill natured or perverse picking of flaws (a carping editorial) 
synonym.acute

critical.adjective
of, relating to, or being a turning point or specially important juncture.(critical phase); crucial, decisive, indispensable, vital (a component critical to the operation of); inclined to judge severely and find fault; characterized by careful, exact evaluation and judgment (a critical reading)
criticality, criticalness.nouns
critically.adverb
synonyms.hypercritical, faultfinding, captious, carping
hypercritical suggests a tendency to judge by unreasonably strict standards (hypercritical.disparagement of other people's work) 

criticize, criticized, criticizing, criticizes.verbs
transitive verb use.to find fault with (criticized the decision as unrealistic); critique; to judge the merits and faults of; analyze and evaluate
intransitive verb use.to act as a critic
criticizable.adjective
criticizer.noun

criticism.noun
anaylsis of quantities and evaluation of comparative worth; making judgements; finding fault

crock.noun
nonsense; foolish talk; a worn out decrepit wreck; severely impaired and disabled (that story is nothing but a crock)

crucial.adjective
important or essential as resolving a crisis; decisive.(a crucial step); marked by final determination of a doubtful issue (the crucial game of a series); important, significant
crucially.adverb
synonyms.acute, critical

crucible.noun
a severe test or trial; a container made of heat resistant substance, as graphite, for melting ores, metals, etc.

cryptococcus.noun
any of various yeast like fungi of the genus Cryptococcus, commonly occurring in the soil and including certain pathogenic species, such as the causative agent of cryptococcosis
cryptococcal.adjective

culpably, culpable, culpably.adjectives
guilty; meriting condemnation or blame especially as wrong or harmful (culpable negligence) 
culpability, culpableness.nouns
culpably.adverb
synonyms.blameworthy, reprehensible

culminate, culminated, culminating, culminates.intransitive verbs
to come to completion; end (years of waiting culminated in a tearful reunion); to reach its highest point or altitude; climax
transitive use-to bring to the point of greatest intensity or to completion
culminant, culminated.adjectives
at the highest point or altitude; culminating 
culmination.noun
reaching the highest point or altitude; culminating; the highest point; that in which a thing culminates

cumbersome.adjective
burdensome; heavy; unwieldy; clumsy

cumulative.adjective
increasing or enlarging by successive addition; acquired by or resulting from accumulation; following successively; consecutive (cumulative sentences)
cumulatively.adverb
cumulativeness.noun

cunning.adjective
dexterous or crafty in the use of special resources (as skill or knowledge) or in attaining an end; displaying keen insight (a cunning observation); characterized by wiliness and trickery (cunning schemes)
cunningness.noun
cunningly.adverb
synonyms.clever, sly

cursory.adjective
rapidly and often superficially performed or produced; hasty
cursoriness.noun
cursorily.adverb

cycle.noun
Any event that occurs repeatedly and regularly over time, such as the motions of the hands of a clock, Earth's rotation, oxygen carbon dioxide cycle, water rain cycle, action of tides, waves, solar cycle, etc. Cycle can refer to a single completed recurring event and to a sequence of such events.

cyclic or cyclical.adjective
of, relating to, or characterized by cycles (a cyclic pattern of weather changes); recurring or moving in cycles (cyclical history)
Chemistry – of or relating to compounds having atoms arranged in a ring or closed chain structure
Botany – having parts arranged in a whorl; forming a whorl
cyclicality.noun
cyclically.adverb

collude, colluded, colluding.intransitive verbs
to act together secretly to achieve a fraudulent, illegal, or deceitful purpose; conspire
colluder.noun

collusion.noun
a secret agreement between two or more parties for a fraudulent, illegal, or deceitful purpose; conspiracy; to collude

collusive.adjective
acting in secret to achieve a fraudulent, illegal, or deceitful goal; collusion
collusively.adverb
collusiveness.noun

comeuppance.noun
a punishment or retribution that one deserves; one's just deserts

cavil, caviled also cavilled, caviling, cavilling, cavils.verbs
intransitive verb use.to find fault unnecessarily; raise trivial objections; quibble
transitive verb use.to quibble about; detect petty flaws in
cavil.noun
a carping or trivial objection
caviler.noun

crestfallen.adjective.comparative.and.superlative.forms more crestfallen; most crestfallen
very sad and disappointed (after losing its last game, the team was crestfallen); dejected; depressed; downcast; dispirited
crestfallenly.adverb
crestfallenness.noun

concern, concerned, concerning, concerns.verbs
transitive verb use.to have to do with or relate to (an article that concerns the plight of homeless people); to be of interest or importance to (this opportunity concerns all of us); to engage the attention of; involve (we concerned ourselves with accomplishing the task at hand); to cause anxiety or uneasiness in (public servants' manipulations posture finances as requiring greater support) is starting to concern its stockholders
intransitive verb use.to be of importance
concern.noun
a matter that relates to or affects one; affair; regard for or interest in someone or something; a troubled or anxious state of mind arising from solicitude or interest; anxiety