Wiktionary
opportunistically
adv. In an opportunistic manner.
Usage examples of "opportunistically".
Ugly animals the size of ferrets, sometime burrow-raiders who scavenged opportunistically from the kills of other predators, the miacoids were an unprepossessing bunch, but nonetheless were the ancestors of the mighty cats and wolves and bears of later times.
Although it does not appear that Saddam has the same kind of well-formulated plan as Adolf Hitler, it is clear that he does have a set of concrete goals that he has attempted to achieve opportunistically.