Robust means powerful
With robust it is meant to be something strong, sturdy, powerful or perhaps muscular. The exact means is linked to the context in which it is used. You can talk about a wine that is robust, it is a powerful wine with a lot of taste. If it's a sturdy laptop, it's a laptop that can withstand a bump... A robust person is a person you can trust and build on. And finally, a robust olive oil, which gives a feeling of stickyness and density when tasting.