Antonym of "Impermeable" -

The antonym of "Impermeable" is:

porous

Explanation:

• "Impermeable" refers to a material or substance that does not allow fluids or gases to pass through it. It's a term often used in scientific and technical contexts.

• "Porous," on the other hand, describes a material or substance that is full of tiny holes, allowing fluids or gases to pass through. This quality is the direct opposite of being impermeable.

• The other options, "inflated," "deflated," and "depressed," do not relate to the ability or inability of materials to allow passage of fluids or gases. These words pertain to different contexts: "inflated" and "deflated" often relate to air or gas pressure in objects, and "depressed" is typically used to describe a psychological state.