- (of a microorganism) causing disease only under certain conditions, as when a person's immune system is impaired.
- (of a disease or infection) caused by such an organism: Pneumocystis pneumonia is an opportunistic disease that often strikes victims of AIDS.
Related formsop·por·tun·is·ti·cal·ly, adverbun·op·por·tun·is·tic, adjective
Can be confusedopportune opportunistic
Examples from the Web for opportunistic
In Colombia, it was perceived more like a coincidence or perhaps even an opportunistic play by the FARC.Venezuela Says Goodbye to Its Lil Friend, While the Rest of the Continent Cheers|Catalina Lobo-Guererro|December 20, 2014|DAILY BEAST
Anyone with the intellect of a ping-pong ball should understand how opportunistic that whistleblowing looks.
Opportunistic, self-centered—no one could actually write a worse TV mom.TV’s Best and Worst Moms: ‘Veep,’ ‘Game of Thrones,’ and More|The Daily Beast Video|May 11, 2014|DAILY BEAST
These Westerners bring (relative) wads of cash and influence, and are gladly met by opportunistic African leaders.
“His offending footprint was vast, predatory, and opportunistic,” Spindler said.Jimmy Savile Report: BBC Presenter Sexually Abused More Than 200 Minors|Peter Jukes|January 11, 2013|DAILY BEAST
The times were ripe for the opportunistic unionism of Gompers and the trade unionists.A History of Trade Unionism in the United States|Selig Perlman
The opportunistic method is strong just where the systematic is weak.The Psychology of Arithmetic|Edward L. Thorndike
In spite of the high regard in which he was held, this opportunistic proposal found little favor.An American Religious Movement|Winfred Ernest Douglas
We can find some opportunistic expedient, but not a solution of the problem.The Positive School of Criminology|Enrico Ferri
Individual liberty, hard fought for under the many signs of literacy, appears to be conformistic at best, and opportunistic.The Civilization of Illiteracy|Mihai Nadin