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

On the big screen, Harford cared for Sandra Dee’s Rosalie Stocker in The Wild and the Innocent (1959) and portrayed the opportunistic older sister of Natalie Wood’s unstable title character in Inside Daisy Clover (1965), the melodrama directed by Robert Mulligan. —Mike Barnes, HollywoodReporter, 9 Nov. 2025

Fanning knows exactly to add a slightly Pollyanna-ish aura to her opportunistic yet optimistic synthetic, as well as a cold, menacing vibe when playing her evil synth twin. —David Fear, Rolling Stone, 4 Nov. 2025

From masquerading hit-men to opportunistic funeral directors, from Orson Welles to Lorenz Hart, a Linklater hero is always an operator. —Brittany Allen, Literary Hub, 4 Nov. 2025

United now view their ensuing transfer activity that summer as ‘opportunistic’, since the circumstances were not ideal. —Andy Mitten, New York Times, 1 Nov. 2025

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