"Intactness" is a word that refers to the state of something being complete or undamaged. If you are looking for synonyms for "intactness", there are a number of options to consider. For instance, you could use the term "wholeness", which refers to the completeness or entirety of something. Alternatively, "integrity" can be used to describe the state of being undivided or unbroken. "Soundness" is also an appropriate synonym, as it refers to the state of being in good condition with no defects or wear and tear. Other synonyms for "intactness" include "perfection", "purity", and "pristine condition".