Antonyms for the word "most plunderous" could include peaceful, secure, serene, wholesome or contented. While "most plunderous" denotes a sense of thievery or destruction, peaceful is the opposite, connoting calm, tranquillity and stability. Secure brings to mind protection, refuge, and stability. Serene refers to a state of serenity, which entails a peaceful, calm, and balanced state of mind. Wholesome signifies healthy, natural and unspoiled, while contented alludes to satisfaction, happiness, and fulfillment. These are just a few words that may counteract the definition of "most plunderous" and steer the discourse towards a more positive perspective.