opportunistic
UK: ˌɒpətjuːˈnɪstɪk | US: ˌɑːpərtuːˈnɪstɪk
adj. exploiting chances for gain without regard for principles or consequences
adj. (biology) adapting to or thriving in varying conditions, often at the expense of others
Derived from "opportunity" (Latin opportunus, "favorable," from ob- "toward" + portus "harbor"), originally describing winds blowing toward a harbor—a metaphor for seizing advantageous moments. The suffix -ist denotes a person who acts, and -ic forms the adjective. The term evolved to describe behavior that capitalizes on circumstances, often with negative connotations of selfishness or lack of ethics.
The politician's opportunistic stance on the issue angered voters.
Opportunistic infections often target individuals with weakened immune systems.
She criticized the media for its opportunistic coverage of the tragedy.
The startup took an opportunistic approach to market gaps during the crisis.
In nature, opportunitic species like raccoons thrive in urban environments.