To do so, he must confront his most dangerous adversary yet, Nick Geraci, a former boxer who worked his way through law school as a Corleone street enforcer, and who is every bit as deadly and cunning as Michael. (bookbrowse.com)
Now acting without assistance from S.H.I.E.L.D., the Avengers work solo in order to bring down HYDRA, but unintentionally spawn a more dangerous adversary in the form of the hostile artificial intelligence, Ultron. (bloody-disgusting.com)
And even after the Benjaminites proved dangerous adversaries, felling twenty - two thousand Israelites, the Israelites persisted, for such an offense must not go unpunished. (religion-online.org)