| arousing animosity or hostility | used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) |
| used especially of drugs or muscles that counteract or neutralize each other's effect | of or relating to the theological doctrine of synergism |
| characterized by antagonism or antipathy | working together; used especially of groups, as subsidiaries of a corporation, cooperating for an enhanced effect |
| incapable of harmonious association | |
| indicating opposition or resistance | |