لا فعلا ولا وهما ولا فرضا
Neither actually, nor in imagination, nor by supposition.
Actually: separating something into parts in fact.
In imagination: conceiving distinct parts within it.
By supposition: positing a division logically or geometrically.
The classical jawhar fard is meant to exclude all three. Practical inability to cut something is not equivalent to indivisibility in principle. A material resisting an ordinary tool has not thereby been proved metaphysically indivisible.