Ungrounded

The accusation was, without a doubt, absolutely ungrounded.

The defendant's claims are fictitious; they are entirely ungrounded in fact.

Unlike coaxial cable where the outer conductor is grounded, twisted pair is usually ungrounded.

If the charge is allowed to build, the core will discharge into the hull of a ship. All ungrounded crew members are fried to a crisp, all electronic system are burned out, and metal bulkheads may be melted and fused together.