Rugged - durable and robust in Structure or design; enduring; "which has a house full of boys It's important to have rugged home furnishings" The phrase 'the strongest' is proper, although 'essentially the most strong' is incorrect. In English, the superlative method of the adjective 'robust' is 'strongest.' a solid https://vapeandchews.com/product/strongest-cbd-disposable-vape-uk/