OPPORTUNISTIC

[op.por.tu.nis.tic] adj (1892): taking advantage of opportunities as they arise: as a: exploiting opportunities with little regard to principle or consequences "a politician considered ~" b: feeding on whatever food is available "~ feeders" c: being or caused by a usu. harmless microorganism that can become pathogenic when the host's resistance is impaired "~ infections" -- op.por.tu.nis.ti.cal.ly adv