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People who are stuck on the ground all the time.

A non-pilot.

Someone who can't fly.

Also, Groundhog.
"Wow, look at all those groundlings! It's too nice a day to be stuck down there!"
by Athene Airheart March 14, 2004
Somebody who can't fly.

Not really a derogatory term, but discriptive. Similar to groundhog.
Don't take your cessna below a thousand feet over a city, you don't want to bother the groundlings.
by Athene Airheart March 19, 2005
a living being that cannot fly and hence that is confined to the ground. Also called landling.
Human beings are groundlings.
by uttam maharjan October 20, 2010