Sparing rod is a term that, despite its negative connotation, implies a frugal, conservative, or cautious use of resources. The antonyms for it, however, refer to a more lavish, extravagant, or wasteful approach. Some of the words that can be used as antonyms for sparing rod include opulence, extravagance, liberality, lavishness, prodigality, and wastefulness. These words signify a disregard for careful management, a willingness to spend without minding the cost, and an overindulgent attitude towards luxury. While sparing rod is often associated with prudence and rationality, its antonyms suggest a more indulgent lifestyle that can come with unintended consequences.