Definition of opportunistic
:taking advantage of opportunities as they arise: such as
a
:exploiting opportunities with little regard to principle (see principle 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
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