Unweakened is a term that describes something that is strong, unimpaired, or unfaltering. There are several synonyms that can be used in place of this word, depending on the context. Some words that could be used instead of unweakened include sturdy, sound, robust, unbroken, resolute, and unyielding. If you are describing an object that has not been damaged, durable or resilient could be used. If you are speaking about someone's resolve, steadfast or tenacious could be options. Ultimately, the synonym you choose will depend on the specific meaning and tone you want to convey.