What word describes something that is unable to be touched or grasped?

The term that describes something that is unable to be touched or grasped is "intangible." This word refers to concepts, ideas, or qualities that do not have a physical presence, making them impossible to perceive through the senses of touch or sight. Examples of intangible items include emotions, intellectual property, and brand reputation.

In contrast, the other choices describe characteristics opposite to intangibility. "Tangible" refers to something that can be physically touched or has a substance that can be perceived through the senses. "Abstract" relates to ideas that are not grounded in concrete realities but do not necessarily imply an inability to be grasped; rather, they denote thoughts or concepts that may be complex or theoretical. "Concrete" signifies something that is solid, definite, and can be physically experienced or observed. Therefore, the correct term for something that cannot be physically touched or grasped is indeed "intangible."