I am fluent in czech, only in speech and conversationally. I learned from family, never formally. I do not believe I have ever encountered "velci..." is this masculine plural? I am assuming it is since it is in the plural section.... just confusing! Why is it this way? Why with a soft c and not a hard k like every other form????
This is the Common Czech https://en.wikipedia.org/wiki/Czech_language#Common_Czech , the native vernacular dialect of most people and the topic of the last skill. People are used to hear it but it is strongly discouraged to use it when talking to foreigners who learn Czech.