One-word substitution (vocabulary): That which cannot be seen Select the single best word that matches the description.

Given data

• Definition: not visible to the eye.

Reasoning through options Invisible — cannot be seen. Correct. Unseen — not seen (perhaps overlooked or hidden), but not necessarily incapable of being seen. Intangible — cannot be touched; about touch, not sight. Insensible — unconscious/imperceptible; not the same as invisible.