Yes, "reckful" is a real word, although it is rarely used in modern English. It means being thoughtful, careful, or prudent, essentially the opposite of "reckless." It comes from the same root as "reck," which means to care or pay attention to.

Examples of Usage:

In older texts, "reckful" might describe someone who is cautious or considerate of consequences: "He was reckful in his approach, weighing every decision carefully."

Why It's Uncommon:

"Reckless" became the dominant term in English, and "reckful" fell out of common usage. Today, terms like "careful," "prudent," or "mindful" are more likely to be used in its place.

So while "reckful" is technically correct and would make sense in context, it might sound archaic or poetic to most modern English speakers.