opportunistic

In addition, the portfolio manager can opportunistically use mutual fund cash flows to rebalance positions, which may help further reduce tracking error relative to a mutual fund.

The new bomber would decrease the odds of such opportunistic aggression.

They were coupling historic starting pitching with opportunistic offense and just enough production out of the bullpen.

"The Chinese Intelligence Services are interested in acquiring information from a number of sources, including policymakers, government staff and democratic institutions and are able to act opportunistically to gather all information they can."

In many cases, the thefts have been opportunistic: Residents have left their keys in the car with the engine on while they run back into the house.