opportunistic
/ˌɑ.pɚˌt(j)uːˈnɪs.tɪk/ adjective C1- Taking advantage of situations that arise. · The danger now isn't so much from the AIDS virus itself as from opportunistic infections.
- Taking advantage of situations to advance one's own interests without regard for moral principles. · You can't trust somebody that opportunistic: he'll stab you in the back the first chance he gets.
From the library
While rural foxes rely heavily on hunting small mammals and birds, city dwellers have become opportunistic omnivores and skilled scavengers.
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