Aerial
Part of speech: adjective
Definition: of, in, or from the air; atmospheric ethereal
Part of speech: noun
Definition: A device for receiving or transmitting radio, television signals etc.
Example sentence: Each year, thousands of UFOs are sighted and reported, which is an impressive tally of unidentified aerial phenomena. Surveys show that roughly one-third of the populace believes that at least some of this sky show is due to extraterrestrial spacecraft, here to probe our airspace and, when that proves boring, our bodies.
Insubstantial
Part of speech: adjective
Definition: Lacking substance; not real or strong.