opportunistic
UK /ˌɒp.əˌtjuːˈnɪs.tɪk/ US /ˌɑ.pɚˌt(j)uːˈnɪs.tɪk/
adj 2
Definitions
adj
1
Taking advantage of situations that arise.
The danger now isn't so much from the AIDS virus itself as from opportunistic infections.
2
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.
[…] an opportunistic relative masquerading as his rescuer, […]
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