exploiting immediate opportunities, especially regardless of planning or principle:an opportunistic political lightweight Ecology (of a plant or animal) able to spread quickly in a previously unexploited habitat: opportunistic populations colonizing new substrates Medicine (of a microorganism or an infection caused by it) affecting patients only or chiefly when the immune system is depressed.
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Pronunciation:
/-ˈnɪstɪk(ə)li/
adverb
