Riddle: A word to the wise is sufficient. What is the contradictory proverb? Let’s look the solution.
If you are wise and heed a warning or a piece of advice, even if it is very brief, you then think that “a word to the wise is sufficient”. For example, you heard about a terrible traffic jam on the news, so you avoid the highway based on that information… just like a wise person would do. As a side note, the shorter-phrase, “a word to the wise,” is more commonly used.
However “Talk is cheap” means something a bit different. It means that it is very easy to talk about what one is going to do or what the correct course of action is, but it is much harder to puts those words into action. So if you believe that “talk is cheap”, then you might be more skeptical to believe and act according to a small piece of information.
Answer: Talk is cheap.