Nondestructive is a term often used to describe techniques, practices or methods that do not cause any harm, damage, or ruin to the subject or object under consideration. To find its antonyms, one may look for opposite words which indicate harmful, damaging, or destructive effects. Some antonyms for nondestructive include destructive, damaging, harmful, catastrophic, fatal, harmful, dangerous, and devastating. Moreover, terms such as aggressive or invasive also carry connotations of causing harm or injury, whereas passive or nonintrusive imply a lack of harmfulness. In summary, when searching for antonyms for nondestructive, one should look for words that express harm and damage.