1. not based on good reason or evidence; without foundation
2. not connected to an electrical ground for safety
Usage: electrical
3. not prevented from flying or going out

Examples

• Her fears about the test were completely ungrounded.
• The accusations against him proved to be ungrounded.
• The old appliance was ungrounded and potentially dangerous.
• Make sure the electrical outlet is not ungrounded before plugging in the device.
• After a week of punishment, the teenager was finally ungrounded.
• The pilot remained ungrounded despite the minor incident.