The word 'prodigal' means to spend or give generously in a reckless or wasteful manner. The antonyms of the word 'prodigal' are 'thrifty', 'frugal', 'economical', 'prudent', 'careful', and 'sparing'. People who are thrifty or frugal are careful in spending money and do not waste it. They are known to save money instead of spending it recklessly. Those who are prudent are careful in spending their money and value their resources. Economical people are concerned about making the most of their resources and are never wasteful. Sparing people are cautious when it comes to spending and conserve their resources, always keeping an eye on the needs of the future.