opportunistic

Adjective

op=por=tun=is=tic

CIDE DICTIONARY

opportunistic, adj.

taking immediate advantage, often unethically, of any circumstance of possible benefit; practising opportunism. [WordNet 1.5]
Causing disease only when the immune system of the host has been weakened, or other damage to the host provides special opportunity for invasion; -- of microorganisms or infectious diseases; as, opportunistic pathogens may infect a burn site; AIDS predisposes a patient to opportunistic infection. [PJC]

For further exploring for "opportunistic" in Webster Dictionary Online

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phrase	search for verses that contains all of the search phrase.	"fish bread" will search for verses that contains "fish bread" in minimum 1 bible version
at least one	search for verses that contains any of the search words.	"fish bread" will search for verses that contains fish OR bread in minumum 1 bible version
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