The word "unweakening" describes something that doesn't become weaker or lose strength. Synonyms for this word include unyielding, steadfast, unwavering, resolute, determined, strong, sturdy, and firm. These words suggest a sense of unbreakable courage and power that cannot be swayed or diminished. Other synonyms for "unweakening" might include robust, stalwart, unflinching, and unshakable. As you can see, there are many words in the English language that can be used to describe the opposite of weakening, and each one carries its own unique connotations. Whether you're writing a story, essay, or academic paper, choosing the right synonym is crucial for conveying your intended meaning.