The opposite is to be mindless, distracted, preoccupied. Mindlessness causes us to react in a habitual way. Mindfulness gives us a choice to respond in a different, wiser way.
Through mindfulness, you will see reality with greater clarity, which will enable you to make better decisions with integrity. It is the proverbial ability to see the wood for the trees. We can teach this skill.
Here you will find more reading and other material on mindfulness.