Definify.com

Webster 1828 Edition

Adj.

Having no foundation or support; as ungrounded hopes or confidence.

ungrounded

ungrounded ‎(comparative more ungrounded, superlative most ungrounded)

Not grounded.
The defendant's claims are fictitious; they are entirely ungrounded in fact.
(electricity, electronics) Not connected to ground potential
Unlike coaxial cable where the outer conductor is grounded, twisted pair is usually ungrounded.