1 Candid

Direct, blunt

2 Candor

The trait of being honest and frank

3 Capitalize

To use to your advantage

4 Catalyst

Something that causes a change or new event

5 Ceaseless

Unending, without pause 

6 Censure

To express strong disapproval

7 Clarify

To make clear or intelligible

8 Coincide

To happen at the same time

9 Competent

Sufficiently qualified

10 Complacent

Satisfied, with no desire to change or improve

11 Complement

To make perfect or complete

12 Conceal

To hide

13 Concur

To agree

14 Condense

To reduce to a shorter form; to make more compact

15 Confine

To limit or restrict; to enclose within bounds

16 Confluence

A coming together of people or things; a joining

17 Consecutively

One after another in uninterrupted succession

18 Console

To give comfort; to lessen grief

19 Contention

A dispute; opposition; rivalry

20 Contours

Line or edge that defines the bounds of an object