opportunistic

/ˌɑpərˈtuːnɪstɪk/
adjective
  1. Taking immediate advantage of a situation, often in a way that is selfish or not planned.
    • His opportunistic approach to networking helped him get a job, but he made few real friends.
    • Some businesses engage in opportunistic pricing during emergencies, which many consider unfair.
    • The thief made an opportunistic grab for the purse when the owner looked away.
  2. Describing an infection or disease that occurs mainly in people with weakened immune systems.
    • Preventing opportunistic diseases is a key part of care for transplant patients.
    • The doctor explained that the fungus causes an opportunistic infection in patients with low immunity.
    • People with HIV are at higher risk for opportunistic infections like pneumonia.
Antonyms
What does "opportunistic" mean? | whatsthatwordmean | whatsthatwordmean