opportunistic

adjective

op·​por·​tu·​nis·​tic ˌä-pər-tü-ˈni-stik 

-tyü-

: taking advantage of opportunities as they arise: such as

a

: exploiting opportunities with little regard to principle (see principle sense 1) or consequences

a politician considered opportunistic

an opportunistic investment

b

: feeding on whatever food is available

opportunistic feeders

opportunistic bears

c

: being or caused by a usually harmless microorganism that can become pathogenic when the host's resistance is impaired

opportunistic infections

opportunistic diseases

opportunistically

ˌä-pər-tü-ˈni-sti-k(ə-)lē 

-tyü-

adverb

Examples of opportunistic in a Sentence

Recent Examples on the Web

The opportunistic crime, though—that’s actually very controllable. — Joel Feder, The Drive, 29 July 2026

From self-sufficient campaigns to opportunistic criminality Defenders used individual incidents, such as supply chain intrusions, ransomware outbreaks, and phishing waves, to quantify risk for the most of the past ten years. — Chuck Brooks, Forbes.com, 28 July 2026

Broadly speaking, these kinds of stories — powered by a stop-them-before-they-kill-again clock, making their antagonists out to be finicky geniuses or horror movie monsters instead of opportunistic mediocrities — strike me as a low form of fiction. — Robert Lloyd, Los Angeles Times, 27 July 2026

Biometric authentication, such as Face ID or fingerprint recognition, generally offers stronger protection against opportunistic thieves because there’s no passcode for someone nearby to observe. — Stefanie Waldek, Travel + Leisure, 26 July 2026

Word History

Etymology

opportunist + -ic entry 1

First Known Use

1892, in the meaning defined above

Rhymes for opportunistic

• anachronistic
• animalistic
• antagonistic
• antiphlogistic
• behavioristic
• cannibalistic
• capitalistic
• characteristic
• collectivistic
• deterministic
• ethnolinguistic
• expressionistic

Kids Definition

opportunistic

noun

op·​por·​tu·​nis·​tic -t(y)ü-ˈnis-tik 

: taking advantage of opportunities as they arise: as

a

: exploiting opportunities with little regard to principle or consequences

an opportunistic cheater

b

: feeding on whatever food is available

opportunistic feeders

Medical Definition

opportunistic

adjective

op·​por·​tu·​nist·​ic -t(y)ü-ˈnis-tik 

1

: of, relating to, or being a microorganism that is usually harmless but can become pathogenic when the host's resistance to disease is impaired

2

: of, relating to, or being an infection or disease caused by an opportunistic organism

Pneumocystis carinii pneumonia and other opportunistic infections that kill AIDS patients

—New York Times