Wiktionary
underexploited
a. Not exploited to any great extent; not used to full advantage.
Usage examples of "underexploited".
It is true that he was as outrageously gifted as the best of the breed, and that these gifts were appallingly underexploited throughout his career (he only played for England once, and towards the end of his time at Arsenal could not even gain a place in the first team).
Who would want to attack a colony with a restricted habitation zone, limited industry, and still underexploited resources?