- (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.
Origin of opportunistic
OTHER WORDS FROM opportunisticop·por·tun·is·ti·cal·ly, adverbun·op·por·tun·is·tic, adjective
WORDS THAT MAY BE CONFUSED WITH opportunisticopportune, opportunistic
How to use opportunistic in a sentence
That’s because wildlife are opportunistic—once they obtain human food they will consistently return for more, Marion says.Once you know what happens to food you leave outdoors, you’ll stop doing it|Alisha McDarris|January 14, 2021|Popular-Science
All in all, the team observed 15 snakes using lasso locomotion, including one opportunistic wild snake that raided a nest box that the researchers had been observing outside of their test arena.These snakes wiggle up smooth poles by turning their bodies into ‘lassoes’|Kate Baggaley|January 13, 2021|Popular-Science
The government also fixed the price of face masks to prevent opportunistic vendors from price gouging.These Asian countries have masterfully limited COVID outbreaks. Here’s how they did it|Naomi Xu Elegant|December 28, 2020|Fortune
To be sure, America’s own approach to global democracy has largely been opportunistic.Butterfly Effect: Who’s the Sh*thole Now?|Charu Kasturi|November 4, 2020|Ozy
They can also be utilized opportunistically to whip up anger against political enemies.The Curious Case of Countries Where Being Gay Is a Crime|James Kirchick|January 2, 2014|DAILY BEAST
We now have more capital than we anticipated, [which will] allow us to opportunistically build what we have not been able to do.A $125 Billion (Taxpayer) Gamble|William D. Cohan|October 20, 2008|DAILY BEAST
We must go at it seriously and scientifically and solidly, not superficially, casually, and opportunistically.