Lessening, saving, preserving, protecting, safeguarding, strengthening, rebuilding, reviving, renewing, and revitalizing are all antonyms for the word "more decimating". When we talk about decimation, we usually mean that something has been reduced to a great extent. However, antonyms for this word are useful to describe the opposite scenario where things are getting better or recuperating instead of falling apart. For example, if a community is working hard to rebuild after a disaster, we might say their efforts are "lessening" the effects of the disaster. Similarly, if a company is "saving" jobs, we could describe their efforts as antonyms of "more decimating".