It is an interesting point. When you first learn words in your mother tongue, you don't do it by outside reference to another language. Why is it different for you when learning a second language?
This is required, to some degree, to become fluent (i.e. intuitive) in a new language too, which is why there is an emphasis on immersion/input in most language-learning circles/ideologies. But when you have an explicit goal, you're more likely to be compelled to want the mental shortcut/jumpstart that a translation provides. There's also the fact that, as a language learner, the context itself often isn't understood very well (or at all), which makes the natural process even slower. This is where the idea of "comprehensible input" comes into it, see: https://en.wikipedia.org/wiki/Input_hypothesis
https://drdru.github.io/stories/intro.html
It is doable. There is a book called Lingua Latina per se Illustrata that does it for Latin. I have to admit that it has some limits. At some point you want to go back to using your mother tongue. English is not my first language. I live in the UK everything I read is in English. There are some words I have seen a thousand times and I sort of know what they mean but they become mine only after I look up for their translation.