Acuminous is a rarely used word that describes someone who is sharp-witted, having an astute and keen mind. Its antonyms are blunt, dull, and obtuse, which refer to someone with a limited capacity for intellectual or creative thinking. They may have trouble solving problems or grasping complex concepts. These characteristics may hinder their ability to think outside the box, make quick decisions, or see things from different perspectives. In contrast, someone who is acuminous is sharp, intelligent, and able to apply their knowledge to various situations. They are usually resourceful and intuitive, making them valuable assets in any profession.