In most cases, the word 'adventurer' was not actually one with positive meaning.
In the not too distant past of conservativeness and simplicity, the word 'adventuring' was actually discriminated against—it had meant that the person involved in such activity did not possess a stable income or a steady lifestyle, and was even forced to do things that they did not have a handle of. Adventurers were therefore simply categorized as no different from the uncouth, the unethical, the unconventional gambits, and those who simply enjoyed risks: inelegant and disliked.