The phrase "vigorous effort" means putting in a lot of energy and determination to accomplish something. It implies working hard and not giving up easily. Full definition
There's little question that discussion moderation requires vigorous effort. (lawyerist.com)
In the end, building a robust, diverse science work force will take vigorous effort from many camps. (sciencemag.org)
The «scary» findings show a discouraging lack of progress in cleaning the devices, despite more vigorous efforts in the wake of deadly superbug outbreaks, experts say. (khn.org)